Slicers (applies to each fact value in each table cell)

Reporting Entity [Axis]

0000105634 (http://www.sec.gov/CIK)

Compensation and Retirement Disclosure [Abstract]	Period [Axis]
	2016-01-01 - 2016-12-31
Compensation and Retirement Disclosure [Abstract]
Schedule of Changes in Benefit Obligations and Assets	The change in benefit obligations and assets of the UK Plan for the years ended December 31, 2016 and 2015 consisted of the following components (in thousands):     2016   2015 Change in pension benefit obligation       Benefit obligation at beginning of year $ 295,825   $ 332,806 Interest cost 10,320   11,603 Actuarial loss (gain) 67,329   (21,707 ) Benefits paid (12,044 )   (9,604 ) Foreign currency exchange rate changes (54,699 )   (17,273 ) Benefit obligation at end of year 306,731   295,825 Change in pension plan assets       Fair value of plan assets at beginning of year 263,555   282,095 Actual return on plan assets 47,728   569 Employer contributions 4,906   5,631 Benefits paid (12,044 )   (9,604 ) Foreign currency exchange rate changes (46,909 )   (15,136 ) Fair value of plan assets at end of year 257,236   263,555 Funded status at end of year $ (49,495 )   $ (32,270 )
Schedule of Net Periodic Benefit Cost Not yet Recognized	Amounts not yet reflected in net periodic pension cost and included in accumulated other comprehensive loss:   2016   2015 Unrecognized losses $ 102,943   $ 88,818
Schedule of Weighted Average Assumptions Used Calculating Benefit Obligation	The weighted average assumptions used to determine benefit obligations as of December 31, 2016 and 2015 were as follows:   2016   2015 Discount rate 2.7 %   3.8 %
Schedule of Weighted Average Assumptions Used Calculate Net Periodic Pension Cost	The weighted average assumptions used to determine net periodic pension cost for the years ended December 31, 2016, 2015 and 2014 were as follows:   2016   2015   2014 Discount rate 3.8 %   3.6 %   4.6 % Annual rate of return on plan assets 6.2 %   6.3 %   6.7 %
Components Of Net Periodic Pension Cost	The components of net periodic pension cost of the UK Plan for the years ended December 31, 2016, 2015 and 2014 were as follows (in thousands):     2016   2015   2014 Interest cost $ 10,320   $ 11,603   $ 14,027 Expected return on plan assets (14,227 )   (16,181 )   (16,888 ) Amortization of unrecognized loss 2,047   2,526   2,029 Net periodic pension cost (income) $ (1,860 )   $ (2,052 )   $ (832 )
Schedule of Weighted Average Asset Allocations and Weighted Average Target Allocations	The weighted average asset allocations and weighted average target allocations at December 31, 2016 and 2015 were as follows:   Asset Category Target Asset Allocation    December 31, 2016   December 31, 2015 Equity securities 45.0 %   44.9 %   43.3 % Debt securities 55.0 %   55.0 %   56.3 % Cash — %   0.1 %   0.4 % Total 100.0 %   100.0 %   100.0 %
Schedule of Plan Assets Fair Value Hierarchy	The following tables set forth by level, within the fair value hierarchy discussed in Note 10 - Fair Value Measurements, the fair value of assets of the UK Plan as of December 31, 2016 and 2015 (in thousands):     Assets at Fair Value as of December 31, 2016 Asset Category     Level 1   Level 2   Level 3   Total Equity and equity like investments $ —   $ 115,416   $ —   $ 115,416 Corporate bonds —   103,912   —   103,912 Government bonds —   37,473   —   37,473 Cash 435   —   —   435 Total $ 435   $ 256,801   $ —   $ 257,236   Assets at Fair Value as of December 31, 2015 Asset Category     Level 1   Level 2   Level 3   Total Equity and equity like investments $ —   $ 114,213   $ —   $ 114,213 Corporate bonds —   114,434   —   114,434 Government bonds —   34,011   —   34,011 Cash 897   —   —   897 Total $ 897   $ 262,658   $ —   $ 263,555
Schedule of Expected Benefit Payments	The following estimated benefit payments are expected to be paid in the following years (in thousands):   Pension Benefits 2017 $ 9,897 2018 $ 10,193 2019 $ 10,498 2020 $ 10,812 2021 $ 11,135 Succeeding five years $ 60,878
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets	The following table shows certain information for the UK Plan where the accumulated benefit obligation is in excess of plan assets as of December 31, 2016 and 2015 (in thousands):   2016   2015 Projected benefit obligation $ 306,731   $ 295,825 Accumulated benefit obligation $ 306,731   $ 295,825 Fair value of plan assets $ 257,236   $ 263,555
Schedule of Multiemployer Plans	The following table lists all domestic MEPPs to which our contributions exceeded $2.0 million in 2016. Additionally, this table also lists all domestic MEPPs to which we contributed in 2016 in excess of $0.5 million for MEPPs in the critical status, “red zone”, and $1.0 million in the endangered status, “orange or yellow zones”, as defined by the PPA (in thousands):      Pension Fund   EIN/Pension Plan Number   PPA Zone Status (1)   FIP/RP Status   Contributions    Contributions greater than 5% of total plan contributions (2)   Expiration date of CBA   2016   2015     2016   2015   2014   Plumbers & Pipefitters National Pension Fund   52-6152779 001   Yellow   Yellow   Implemented   $ 12,034   $ 12,021   $ 10,425   No   January  2017 to May 2023 Sheet Metal Workers National Pension Fund   52-6112463 001   Yellow   Yellow   Implemented   11,280   10,891   9,977   No   January 2017 to June 2020 National Automatic Sprinkler Industry Pension Fund   52-6054620 001   Red   Red   Implemented   11,075   6,697   6,000   No   May 2017 to March 2021 National Electrical Benefit Fund   53-0181657 001   Green   Green   N/A   10,328   8,513   7,985   No   March 2017 to May 2020 Pension, Hospitalization & Benefit Plan of the Electrical Industry- Pension Trust Account   13-6123601 001   Green   Green   N/A   9,687   7,543   6,219   No   January 2018 to June 2020   Pension Fund   EIN/Pension Plan Number   PPA Zone Status (1)   FIP/RP Status   Contributions   Contributions greater than 5% of total plan contributions (2)   Expiration date of CBA   2016   2015     2016   2015   2014   Northern California Pipe Trades Pension Plan   94-3190386 001   Green   Green   N/A   6,495   3,544   3,270   Yes   May 2017 to June 2018 Central Pension Fund of the IUOE & Participating Employers   36-6052390 001   Green   Green   N/A   6,211   6,465   6,518   No   February 2017 to November 2019 Electrical Contractors Association of the City of Chicago Local Union 134, IBEW Joint Pension Trust of Chicago Pension Plan 2   51-6030753 002   Green   Green   N/A   5,518   5,759   4,051   No   June 2017 to December 2017 Plumbers Pipefitters & Mechanical Equipment Service Local Union 392 Pension Plan   31-0655223 001   Red   Red   Implemented   5,202   5,554   4,962   Yes   June 2019 Sheet Metal Workers Pension Plan of Northern California   51-6115939 001   Red   Red   Implemented   5,164   4,851   3,467   No   June 2017 to June 2019 Southern California Pipe Trades Retirement Fund   51-6108443 001   Green   Green   N/A   4,371   2,743   2,863   No   June 2017 to August 2019 Pipefitters Union Local 537 Pension Fund   51-6030859 001   Green   Green   N/A   3,970   3,939   2,981   Yes   January 2017 to August 2017 NECA-IBEW Pension Trust Fund   51-6029903 001   Green   Green   N/A   3,752   1,498   1,287   No   May 2017 to December 2017 Eighth District Electrical Pension Fund   84-6100393 001   Green   Green   N/A   3,444   3,411   2,695   Yes   August 2017 to May 2018 Electrical Workers Local No. 26 Pension Trust Fund   52-6117919 001   Green   Green   N/A   3,390   2,620   2,880   Yes   June 2017 to May 2019 Southern California IBEW-NECA Pension Trust Fund   95-6392774 001   Red   Orange   Implemented (3)   3,289   2,894   2,776   No   June 2019 to May 2020 U.A. Plumbers Local 24 Pension Fund   22-6042823 001   Green   Green   N/A   3,147   2,431   1,998   Yes   April 2020 Sheet Metal Workers Pension Plan of Southern California, Arizona & Nevada   95-6052257 001   Yellow   Red   Pending   2,946   2,310   1,824   No   June 2017 to June 2020 U.A. Local 393 Pension Trust Fund Defined Benefit   94-6359772 002   Green   Green   N/A   2,490   4,597   3,585   Yes   June 2017 to June 2018 Heating, Piping & Refrigeration Pension Fund   52-1058013 001   Green   Green   N/A   2,402   1,948   1,877   No   July 2017 to July 2019 San Diego Electrical Pension Plan   95-6101801 001   Green   Red   N/A   2,216   2,109   1,878   Yes   May 2019 to May 2020 Boilermaker-Blacksmith National Pension Trust   48-6168020 001   Yellow   Yellow   Implemented   1,710   1,367   1,177   No   April 2017 to September 2018 U.A. Local 38 Defined Benefit Pension Plan   94-1285319 001   Yellow   Yellow   Implemented   1,521   1,526   1,605   No   June 2017 Plumbing & Pipe Fitting Local 219 Pension Fund   34-6682376 001   Red   Red   Implemented   838   1,262   1,107   Yes   May 2017 Pension Fund   EIN/Pension Plan Number   PPA Zone Status (1)   FIP/RP Status   Contributions   Contributions greater than 5% of total plan contributions (2)   Expiration date of CBA   2016   2015     2016   2015   2014   Plumbers & Pipefitters Local Union No. 502 & 633 Pension Fund   61-6078145 001   Red   Red   Implemented   713   365   232   No   May 2017 to July 2017 Steamfitters Local Union No. 420 Pension Plan   23-2004424 001   Red   Red   Implemented   709   845   862   No   April 2017 to May 2017 Carpenters Pension Trust Fund for Northern California   94-6050970 001   Red   Red   Implemented   584   380   522   No   June 2019 Other Multiemployer Pension Plans                   42,811   38,973   42,968       Various Total Contributions                   $ 167,297   $ 147,056   $ 137,991           _________________ (1) The zone status represents the most recent available information for the respective MEPP, which may be 2015 or earlier for the 2016 year and 2014 or earlier for the 2015 year. (2) This information was obtained from the respective plan’s Form 5500 (“Forms”) for the most current available filing. These dates may not correspond with our fiscal year contributions. The above noted percentages of contributions are based upon disclosures contained in the plans’ Forms. Those Forms, among other things, disclose the names of individual participating employers whose annual contributions account for more than 5% of the aggregate annual amount contributed by all participating employers for a plan year. Accordingly, if the annual contribution of two or more of our subsidiaries each accounted for less than 5% of such contributions, but in the aggregate accounted for in excess of 5% of such contributions, that greater percentage is not available and accordingly is not disclosed. (3) For these respective plans, a funding surcharge was currently in effect for 2016.