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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Funded Status      
Noncurrent assets $ 57,568 $ 83,060  
Noncurrent liabilities (166,101) (170,773)  
Pension Benefits      
Change in Benefit Obligations      
Benefit obligations at January 1 560,385 503,997  
Service cost 11,125 11,023 $ 10,417
Interest cost 17,214 18,450 18,752
Participant contributions 97 100  
Plan amendments 0 0  
Actuarial (gains) losses (29,181) 27,967  
Benefits paid (23,724) (28,953)  
Settlements (726) (573)  
Special termination charge 0 11,384  
Currency translation (7,519) 16,990  
Benefit obligations at December 31 525,520 560,385 503,997
Change in Plan Assets      
Fair value of plan assets at January 1 492,677 433,262  
Actual return on plan assets (26,804) 81,192  
Employer contributions 4,718 4,094  
Participant contributions 97 100  
Settlements (726) (573)  
Benefits paid 23,724 28,953  
Administrative Expenses Paid (704) (222)  
Currency translation (2,422) 3,777  
Fair value of plan assets at December 31 443,112 492,677 433,262
Funded Status      
Funded status at December 31 (82,408) (67,708)  
Unrecognized transition losses 5 6  
Unrecognized net actuarial losses 178,640 162,032  
Net amount recognized 95,550 93,566  
Noncurrent assets 57,568 83,060  
Current liabilities (5,741) (5,126)  
Noncurrent liabilities (134,231) (145,642)  
Net amount recognized (82,404) (67,708)  
Amounts Recognized in Accumulated Other Comprehensive Loss      
Net actuarial losses 178,640 162,032  
Prior service credit (687) (764)  
Unrecognized net initial obligation 5 6  
Total (before tax effects) 177,958 161,274  
Accumulated Benefit Obligations for all Defined Benefit Plans 489,159 525,385  
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment 2,151 0  
Other Benefits      
Change in Benefit Obligations      
Benefit obligations at January 1 22,027 23,680  
Service cost 369 403 426
Interest cost 793 882 946
Participant contributions 302 264  
Plan amendments 0 (1,694)  
Actuarial (gains) losses 7,841 1,465  
Benefits paid (2,855) (2,973)  
Settlements 0 0  
Special termination charge 0 0  
Currency translation 0 0  
Benefit obligations at December 31 28,477 22,027 23,680
Change in Plan Assets      
Fair value of plan assets at January 1 0 0  
Actual return on plan assets 0 0  
Employer contributions 2,553 2,709  
Participant contributions 302 264  
Settlements 0 0  
Benefits paid 2,855 2,973  
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 (28,477) (22,027)  
Unrecognized transition losses 0 0  
Unrecognized net actuarial losses 12,096 5,007  
Net amount recognized (18,305) (19,348)  
Noncurrent assets 0 0  
Current liabilities (2,736) (1,584)  
Noncurrent liabilities (25,741) (20,443)  
Net amount recognized (28,477) (22,027)  
Amounts Recognized in Accumulated Other Comprehensive Loss      
Net actuarial losses 12,096 5,007  
Prior service credit (1,924) (2,328)  
Unrecognized net initial obligation 0 0  
Total (before tax effects) 10,172 2,679  
Accumulated Benefit Obligations for all Defined Benefit Plans 0 0  
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment $ 0 $ 0