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Recently Issued Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle |  |  |
Excess tax benefit recorded in additional paid in capital | $ 6,087 | $ 4,625 | $ 209
ASU 2016-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle |  |  |
Cumulative effect adjustment to increase retained earnings and deferred tax assets | 39,000 |  |
Excess tax benefit recorded in additional paid in capital | $ 6,100 | $ 4,600 | $ 200

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