Pensions and Other Post-retirement Benefits - Schedule of Defined Benefit Pension Plans and Other Postretirement Benefits Plan (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in Plan Assets
Fair value of plan assets at January 1	$ 419,088
Fair value of plan assets at December 31	433,262	$ 419,088
Funded Status
Noncurrent assets	62,916	62,072
Noncurrent liabilities	(157,927)	(156,160)
Pension Benefits
Change in Benefit Obligations
Benefit obligations at January 1	491,180	519,194
Service cost	10,417	11,517	$ 9,425
Interest cost	18,752	18,314	19,340
Participant contributions	100	105
Plan amendments	(1,092)	604
Actuarial (gains) losses	9,123	(21,073)
Benefits paid	(19,550)	(19,261)
Settlements	(381)	(2,094)
Currency translation	(4,389)	(16,126)
Benefit obligations at December 31	503,997	491,180	519,194
Change in Plan Assets
Fair value of plan assets at January 1	419,088	445,299
Actual return on plan assets	31,418	(4,754)
Employer contributions	3,878	4,058
Settlements	(381)	(2,094)
Benefits paid	(19,550)	(16,979)
Reimbursement of German benefits	0	(2,282)
Administrative Expenses Paid	0	6
Currency translation	(1,291)	(4,271)
Fair value of plan assets at December 31	433,262	419,088	445,299
Funded Status
Funded status at December 31	(70,735)	(72,092)
Defined Benefit Plan, before Adoption of FAS 158 Recognition Provisions, Net Transition Obligations (Assets), Not yet Recognized	8	12
Unrecognized prior service (credit) cost	(646)	525
Unrecognized net actuarial losses	187,738	188,531
Net amount recognized	116,365	116,976
Noncurrent assets	62,916	62,072
Current liabilities	(4,620)	(5,033)
Noncurrent liabilities	(129,031)	(129,131)
Net amount recognized	(70,735)	(72,092)
Amounts Recognized in Accumulated Other Comprehensive Loss
Net actuarial losses	187,738	188,531
Prior service (credit) cost	(646)	525
Unrecognized net initial obligation	8	12
Total (before tax effects)	187,100	189,068
Accumulated Benefit Obligations for all Defined Benefit Plans	465,448	453,382
Curtailments	163	0
Other Benefits
Change in Benefit Obligations
Benefit obligations at January 1	22,974	26,851
Service cost	426	444	538
Interest cost	946	863	1,107
Participant contributions	222	255
Plan amendments	(400)	0
Actuarial (gains) losses	1,285	(3,998)
Benefits paid	(1,773)	(1,441)
Settlements	0	0
Currency translation	0	0
Benefit obligations at December 31	23,680	22,974	26,851
Change in Plan Assets
Fair value of plan assets at January 1	0	0
Actual return on plan assets	0	0
Employer contributions	1,551	1,186
Settlements	0	0
Benefits paid	(1,773)	(1,441)
Reimbursement of German benefits	0	0
Administrative Expenses Paid	0	0
Currency translation	0	0
Fair value of plan assets at December 31	0	0	$ 0
Funded Status
Funded status at December 31	(23,680)	(22,974)
Defined Benefit Plan, before Adoption of FAS 158 Recognition Provisions, Net Transition Obligations (Assets), Not yet Recognized	0	0
Unrecognized prior service (credit) cost	(1,505)	(1,524)
Unrecognized net actuarial losses	3,643	2,117
Net amount recognized	(21,542)	(22,381)
Noncurrent assets	0	0
Current liabilities	(1,638)	(1,382)
Noncurrent liabilities	(22,042)	(21,592)
Net amount recognized	(23,680)	(22,974)
Amounts Recognized in Accumulated Other Comprehensive Loss
Net actuarial losses	3,643	2,425
Prior service (credit) cost	(1,505)	(1,523)
Unrecognized net initial obligation	0	0
Total (before tax effects)	2,138	902
Accumulated Benefit Obligations for all Defined Benefit Plans	0	0
Curtailments	$ 0	$ 0