Employee Benefit Plans - Disaggregated Plan Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 61,952	$ 72,347	$ 69,372
Accumulated benefit obligation	61,952	72,347
Fair value of plan assets	77,141	71,286	75,855
U.S.
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	235,175	216,577	228,390
Accumulated benefit obligation	235,175	216,577
Fair value of plan assets	$ 189,240	$ 171,240	$ 167,947