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Income Taxes - Additional Information (Detail) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Income Tax Disclosure [Abstract] |  |  |  |
Statutory tax rate | 35.00% | 35.00% | 35.00% | 35.00%
Effective tax rate, statutory federal rate net of discrete federal and state taxes | (5.50%) | (5513.00%) | 56.00% | (19.00%)
Discrete rate impact for provision to return adjustment |  |  | 7.00% |

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