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Employee Benefit Plans - Summary of Retirement Plan Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Employee Benefit Plans [Line Items]      
Retirement plan expense $ 42,937 $ 56,914 $ 58,096
Defined benefit pension plans      
Schedule of Employee Benefit Plans [Line Items]      
Retirement plan expense 12,366 7,428 13,999
Defined contribution retirement plans      
Schedule of Employee Benefit Plans [Line Items]      
Retirement plan expense 35,318 38,508 37,661
Postretirement benefit plans      
Schedule of Employee Benefit Plans [Line Items]      
Retirement plan expense (2,148) 963 1,343
Deferred compensation and excess benefit plans      
Schedule of Employee Benefit Plans [Line Items]      
Retirement plan expense $ (2,599) $ 10,015 $ 5,093