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Employee Benefit Plans (Narrative) (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
agreement
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Employee Benefit Plan [Line Items]      
Maximum percentage of contribution 5.00%    
Number of multiemployer pension plans | agreement 6    
Deferred Compensation Plan [Member]      
Employee Benefit Plan [Line Items]      
Percentage of employee's eligible compensation that represents the maximum amount of employer matching contribution to plan 6.00% 6.00% 6.00%
Percentage of salary that may voluntarily be elected to be deferred 80.00%    
Percentage of bonuses, commissions and restricted share unit grants that may voluntarily be elected to be deferred 100.00%    
Total liability for deferred compensation $ 21,051 $ 19,387  
Voluntary Savings And Investment Plan      
Employee Benefit Plan [Line Items]      
Total employer expenses, including employer matching contributions $ 10,420 $ 4,702 $ 4,765
Retirement Savings Plan [Member]      
Employee Benefit Plan [Line Items]      
Contribution to a deferred profit sharing plan 3.00%    
Minimum [Member]      
Employee Benefit Plan [Line Items]      
Percentage of every dollar of a participating employee's pre-tax contributions as matching contribution to 401(k) Plan 50.00%    
Percentage of employee's eligible compensation that represents the maximum amount of employer matching contribution to plan 3.00%    
Maximum [Member]      
Employee Benefit Plan [Line Items]      
Percentage of every dollar of a participating employee's pre-tax contributions as matching contribution to 401(k) Plan 100.00%    
Percentage of employee's eligible compensation that represents the maximum amount of employer matching contribution to plan 6.00%