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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax [Line Items]                        
Effective tax rate                 21.94% 36.80% 37.76%  
Income tax benefit resulting from the reduction of deferred tax liabilities $ (70,000)               $ (70,000)      
Effective tax rate excluding impact of income tax benefit                 39.00%      
Effective income tax rate favorable impact of change in uncertain tax positions           $ 10,600            
Effective tax rate excluding impact of tax settlement                   38.87% 37.76%  
Increase (decrease) in net deferred tax liability                 $ (74,600)      
Adjustment to additional paid-in capital for excess tax benefits related to stock-based awards                   $ 4,200 $ 11,600  
Income tax expense for excess tax deficiencies                 200      
Net operating loss carryforwards for federal and state tax 116,000       $ 130,000       116,000 130,000 136,600  
Uncertain tax position liability 10,972       9,469       10,972 9,469 18,447 $ 17,165
Unrecognized tax benefits that would impact effective tax rate 10,700               10,700      
Increase (decrease) in uncertain tax position                 1,500 (9,000)    
Expected decrease in uncertain tax position in the next twelve months 1,100               1,100      
Income tax expense (benefit) (27,761) $ 42,119 $ 40,725 $ 34,967 49,919 $ 44,272 $ 51,601 $ 43,411 90,050 189,203 204,038  
Company's accrued liability for interest and penalties related to income tax liabilities $ 1,200       $ 1,400       1,200 1,400    
Interest and Penalties [Member]                        
Income Tax [Line Items]                        
Income tax expense (benefit)                 $ (200) $ (7,900) $ 600  
Earliest Tax Year [Member]                        
Income Tax [Line Items]                        
Federal and state income tax examinations                 2013      
Latest Tax Year [Member]                        
Income Tax [Line Items]                        
Federal and state income tax examinations                   2016    
Minimum [Member]                        
Income Tax [Line Items]                        
Expiration period of operating loss carryforwards                 2019      
Maximum [Member]                        
Income Tax [Line Items]                        
Expiration period of operating loss carryforwards                 2037