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Employee Benefit Plans - Summary of Changes in Benefit Obligation and Plan Assets for Defined Benefit Pension and Postretirement Benefit Plans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Change in Plan Assets:      
Plan assets at fair value, beginning of year $ 475,940    
Plan assets at fair value, end of year 435,274 $ 475,940  
Net Amount Recognized in Consolidated Balance Sheets:      
Noncurrent accrued benefit liability (195,916) (229,963)  
Amounts Recognized in Accumulated Other Comprehensive Loss:      
Tax benefits related to changes in benefit obligation and plan assets which are also included in accumulated other comprehensive loss 86,800 88,000  
Defined benefit pension plans      
Change in Benefit Obligation:      
Benefit obligation, beginning of year 677,641 616,938  
Service cost 6,105 7,515 $ 12,982
Interest cost 26,007 27,708 25,580
Impact of currency exchange rate changes (11,016) (10,673)  
Actuarial loss (gain) (14,604) 75,839  
Benefits paid (67,994) (39,686)  
Plan amendments (4,649) 0  
Benefit obligation, end of year 611,490 677,641 616,938
Change in Plan Assets:      
Plan assets at fair value, beginning of year 475,940 456,445  
Actual return on plan assets (690) 43,804  
Employer contributions 33,353 21,596  
Impact of currency exchange rate changes (5,335) (6,219)  
Benefits paid (67,994) (39,686)  
Plan assets at fair value, end of year 435,274 475,940 456,445
Net Amount Recognized in Consolidated Balance Sheets:      
Funded status, end of year (176,216) (201,701)  
Current accrued benefit liability (7,416) (2,540)  
Noncurrent accrued benefit liability (168,800) (199,161)  
Total accrued benefit liability (176,216) (201,701)  
Amounts Recognized in Accumulated Other Comprehensive Loss:      
Net actuarial loss 244,780 253,593  
Prior service cost (credit) 120 (9,036)  
Total amount recognized in accumulated other comprehensive loss, before tax 244,900 244,557  
Postretirement benefit plans      
Change in Benefit Obligation:      
Benefit obligation, beginning of year 34,402 37,914  
Service cost 54 67 82
Interest cost 1,194 1,377 1,585
Impact of currency exchange rate changes 0 0  
Actuarial loss (gain) (2,981) (2,188)  
Benefits paid (2,253) (2,768)  
Plan amendments 0 0  
Benefit obligation, end of year 30,416 34,402 37,914
Change in Plan Assets:      
Plan assets at fair value, beginning of year 0 0  
Actual return on plan assets 0 0  
Employer contributions 2,253 2,768  
Impact of currency exchange rate changes 0 0  
Benefits paid (2,253) (2,768)  
Plan assets at fair value, end of year 0 0 $ 0
Net Amount Recognized in Consolidated Balance Sheets:      
Funded status, end of year (30,416) (34,402)  
Current accrued benefit liability (3,300) (3,600)  
Noncurrent accrued benefit liability (27,116) (30,802)  
Total accrued benefit liability (30,416) (34,402)  
Amounts Recognized in Accumulated Other Comprehensive Loss:      
Net actuarial loss 1,784 4,914  
Prior service cost (credit) 0 0  
Total amount recognized in accumulated other comprehensive loss, before tax $ 1,784 $ 4,914