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, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in Plan Assets
Fair value of plan assets at January 1	$ 445,299
Fair value of plan assets at December 31	419,088	$ 445,299
Funded Status
Noncurrent assets	62,072	75,017
Noncurrent liabilities	(156,160)	(174,598)
Pension Benefits
Change in Benefit Obligations
Benefit obligations at January 1	519,194	440,359
Service cost	11,517	9,425	$ 11,132
Interest cost	18,314	19,340	17,934
Participant contributions	105	130
Plan amendments	604	(302)
Actuarial (gains) losses	(21,073)	88,069
Benefits paid	(19,261)	(19,193)
Settlements	(2,094)	(717)
Currency translation	(16,126)	(17,917)
Benefit obligations at December 31	491,180	519,194	440,359
Change in Plan Assets
Fair value of plan assets at January 1	445,299	434,569
Actual return on plan assets	(4,754)	30,209
Employer contributions	4,058	4,077
Settlements	(2,094)	(717)
Benefits paid	(16,979)	(16,507)
Reimbursement of German benefits	(2,282)	(2,686)
Administrative Expenses Paid	6	0
Currency translation	(4,271)	(3,776)
Fair value of plan assets at December 31	419,088	445,299	434,569
Funded Status
Funded status at December 31	(72,092)	(73,895)
Defined Benefit Plan, before Adoption of FAS 158 Recognition Provisions, Net Transition Obligations (Assets), Not yet Recognized	12	16
Unrecognized prior service cost (credit)	525	10
Unrecognized net actuarial losses	188,531	192,692
Net amount recognized	116,976	118,823
Noncurrent assets	62,072	75,017
Current liabilities	(5,033)	(5,380)
Noncurrent liabilities	(129,131)	(143,532)
Net amount recognized	(72,092)	(73,895)
Amounts Recognized in Accumulated Other Comprehensive Loss
Net actuarial losses	188,531	192,692
Prior service cost (credit)	525	10
Unrecognized net initial obligation	12	16
Total (before tax effects)	189,068	192,718
Accumulated Benefit Obligations for all Defined Benefit Plans	453,382	479,764
Other Benefits
Change in Benefit Obligations
Benefit obligations at January 1	26,851	26,732
Service cost	444	538	687
Interest cost	863	1,107	1,050
Participant contributions	255	259
Plan amendments	0	0
Actuarial (gains) losses	(3,998)	(200)
Benefits paid	(1,441)	(1,585)
Settlements	0	0
Currency translation	0	0
Benefit obligations at December 31	22,974	26,851	26,732
Change in Plan Assets
Fair value of plan assets at January 1	0	0
Actual return on plan assets	0	0
Employer contributions	1,186	1,326
Settlements	0	0
Benefits paid	(1,441)	(1,585)
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	(22,974)	(26,851)
Defined Benefit Plan, before Adoption of FAS 158 Recognition Provisions, Net Transition Obligations (Assets), Not yet Recognized	0	0
Unrecognized prior service cost (credit)	(1,524)	(1,858)
Unrecognized net actuarial losses	2,117	6,450
Net amount recognized	(22,381)	(22,259)
Noncurrent assets	0	0
Current liabilities	(1,382)	(1,457)
Noncurrent liabilities	(21,592)	(25,394)
Net amount recognized	(22,974)	(26,851)
Amounts Recognized in Accumulated Other Comprehensive Loss
Net actuarial losses	2,425	6,450
Prior service cost (credit)	(1,523)	(1,858)
Unrecognized net initial obligation	0	0
Total (before tax effects)	902	4,592
Accumulated Benefit Obligations for all Defined Benefit Plans	$ 0	$ 0