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Schedule of Defined Benefit Plans Disclosures (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure    
Ending Balance $ 325,800  
Significant Unobservable Inputs (Level 3) | Group Annuity Insurance Contracts    
Defined Benefit Plan Disclosure    
Beginning Balance 29,456 $ 29,392
Settlements (28,560)  
Purchases of group annuity insurance contracts   709
Interest and market value adjustments 959 5,308
Benefits paid (244) (611)
Other (61) (634)
Non-U.S. currency movement 1,616 (4,708)
Ending Balance $ 3,166 $ 29,456