Employee Benefit Plans - Estimated Benefit Payments (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Total	$ 145,613
2018	12,623
2019	12,093
2020	12,643
2021	16,778
2022	15,890
Thereafter	75,586
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Total	36,203
2018	3,079
2019	3,189
2020	3,301
2021	3,419
2022	3,540
Thereafter	19,675
U.S.
Defined Benefit Plan Disclosure [Line Items]
Total	109,410
2018	9,544
2019	8,904
2020	9,342
2021	13,359
2022	12,350
Thereafter	$ 55,911