Pensions - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Non-elective and matching contributions		$ 16,581	$ 16,296	$ 14,489
Unrecognized prior service cost		1,429
Unrecognized prior service credits, net of tax		1,418
Unrecognized actuarial losses		128,414
Unrecognized actuarial losses, net of tax		111,377
Increase (decrease) benefit plan exceed projected benefit obligation			8,034
Fair Value of Plan Assets for Plans with Benefit Obligations in Excess of Plan Assets			31,226
Cumulative Other Comprehensive Loss [Member]
Defined Benefit Plan Disclosure [Line Items]
Cumulative other comprehensive loss and expected to be recognized in net periodic benefit cost		231
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Cumulative other comprehensive loss and expected to be recognized in net periodic benefit cost		4,440
U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Cost of providing special or contractual termination benefits recognized during period	$ 16,287
Cost of providing special or contractual termination benefit recognized during period to vested individuals outside defined pension plan	$ 2,813
Settlements				(19,100)
Gain (loss) due to settlements and curtailments		0	0	(3,637)
Defined Benefit Plan, Accumulated Benefit Obligation		303,446	306,760
Increase (decrease) benefit plan exceed projected benefit obligation		(49,963)	(58,373)
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year		0
Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Gain (loss) due to settlements and curtailments		(538)	(132)	$ (444)
Defined Benefit Plan, Accumulated Benefit Obligation		179,854	170,430
Increase (decrease) benefit plan exceed projected benefit obligation		(127,964)	$ (114,956)
Defined Benefit Plans, Estimated Future Employer Contributions in Next Fiscal Year		$ 5,200