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172 - Disclosure - Share-Based Compensation - Summary of Nonvested Restricted Stock Activity and Related Information (Detail)
(http://www.AmetekInc.com/taxonomy/role/DisclosureShareBasedCompensationSummaryOfNonvestedRestrictedStockActivityAndRelatedInformation)
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]0001037868 (http://www.sec.gov/CIK)
Award Type [Axis]Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
Beginning balance, Nonvested restricted stock outstanding, Shares
1,061,000  
 
Granted, Shares
376,000  
 
Vested, Shares
(292,000) 
 
Forfeited, Shares
(126,000) 
 
Ending balance, Nonvested restricted stock outstanding, Shares
1,019,000  
 
1,061,000  
 
Beginning balance, Nonvested restricted stock outstanding, Weighted Average Grant Date Fair Value
46.32  
 
Granted, Weighted Average Grant Date Fair Value
46.91  
52.31  
Vested, Weighted Average Grant Date Fair Value
38.13  
 
Forfeited, Weighted Average Grant Date Fair Value
48.66  
 
Ending balance, Nonvested restricted stock outstanding, Weighted Average Grant Date Fair Value
48.59  
46.32