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Acquisitions - Summary of Final Fair Values of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Acquisition Date [Line Items]      
Goodwill $ 454,612 $ 443,529 $ 448,399
As Previously Reported [Member]      
Acquisition Date [Line Items]      
Goodwill   450,311  
Precision Engineered Products Group [Member]      
Acquisition Date [Line Items]      
Goodwill   370,904 372,709
Current liabilities   21,354 21,354
Non-current deferred tax liabilities   94,755 95,435
Other non-current liabilities   2,208 $ 2,208
Precision Engineered Products Group [Member] | As Previously Reported [Member]      
Acquisition Date [Line Items]      
Goodwill   8,300  
Current liabilities   200  
Non-current deferred tax liabilities   7,900  
Other non-current liabilities   $ 200