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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2015
Dec. 31, 2012
Income Tax Contingency [Line Items]          
Effective tax rate 37.76% 37.63% 37.44%    
Excess tax benefits related to stock-based awards, which increased the cash flow from financing activities $ 11,600 $ 17,500 $ 19,000    
Net operating loss carryforwards for federal and state tax 136,600 29,000 16,900    
Company's total liability for uncertain tax positions 18,447 17,165 14,902   $ 13,072
Uncertain tax positions recognized would favorably impact its effective tax rate 17,100        
Increase in uncertain tax position 1,200 2,300      
Increase in uncertain tax position 2,500        
Decrease in uncertain tax position 1,900        
Increase (decrease) of interest and penalties 600 300 $ (600)    
Company's accrued liability for interest and penalties related to income tax liabilities $ 9,300 $ 8,700      
Earliest Tax Year [Member]          
Income Tax Contingency [Line Items]          
Federal and state income tax examinations 2004        
Latest Tax Year [Member]          
Income Tax Contingency [Line Items]          
Federal and state income tax examinations 2014        
Minimum [Member]          
Income Tax Contingency [Line Items]          
Expiration period of operating loss carryforwards 2019        
Uncertain tax positions recognized would favorably impact its effective tax rate       $ 7,000  
Decrease in uncertain tax position       7,000  
Maximum [Member]          
Income Tax Contingency [Line Items]          
Expiration period of operating loss carryforwards 2035        
Uncertain tax positions recognized would favorably impact its effective tax rate       9,000  
Decrease in uncertain tax position       $ 9,000