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Employee Benefit Plans - Summary of Retirement Plan Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Employee Benefit Plans [Line Items]      
Retirement plan expense $ 57,073 $ 68,244 $ 85,984
Defined contribution retirement plans      
Schedule of Employee Benefit Plans [Line Items]      
Retirement plan expense 40,673 43,819 43,694
Defined benefit pension plans      
Schedule of Employee Benefit Plans [Line Items]      
Retirement plan expense 14,779 18,124 30,747
Deferred compensation and excess benefit plans      
Schedule of Employee Benefit Plans [Line Items]      
Retirement plan expense 225 4,840 9,298
Postretirement benefit plans      
Schedule of Employee Benefit Plans [Line Items]      
Retirement plan expense $ 1,396 $ 1,461 $ 2,245