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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Tax Disclosure [Abstract]    
Effective rate 53.60% 44.30%
Income tax expense $ 7,942 $ 9,600
Federal statutory rate 35.00% 35.00%
Income tax expense $ 1,000  
Pre-tax federal net operating losses $ 3,671  
Pre-tax federal net operating losses expiration date 2024  
Tax effected NOLs $ 2,400