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2422405 - Disclosure - Share-Based Compensation - Restricted common shares and restricted stock units activity (Details)
(http://www.archcapgroup.com/role/ShareBasedCompensationRestrictedCommonSharesAndRestrictedStockUnitsActivityDetails)
TableSchedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000947484 (http://www.sec.gov/CIK)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
Award Type [Axis]
Restricted Common SharesRestricted Unit Awards
Unvested Shares:
 
 
Unvested balance, beginning of year (in shares)
1,800,593  
264,629  
Granted (in shares)
417,956  
63,024  
Vested (in shares)
(541,409) 
(89,054) 
Forfeited (in shares)
(30,816) 
(15,113) 
Unvested balance, end of year (in shares)
1,646,324  
 
223,486  
 
Weighted Average Grant Date Fair Value:
 
 
Unvested balance, beginning of year, weighted average grant date fair value
51.94  
51.33  
Granted, weighted average grant date fair value
71.76  
71.50  
Vested, weighted average grant date fair value
57.72  
56.20  
Forfeited, weighted average grant date fair value
57.76  
54.84  
Unvested balance, end of year, weighted average grant date fair value
54.96  
54.84