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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Cumulative-effect adjustment from adoption of ASU 2016-09, net of tax | $ 609 |  | $ 609 |
Retained Earnings [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Cumulative-effect adjustment from adoption of ASU 2016-09, net of tax | (957) |  | (957) |
Accounting Standards Update (“ASU”) 2016-09 [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Excess tax benefit from option exercises recognized as a reduction to income tax expense | $ 16,464 |  | 36,364 |
Excess tax benefit recognized |  | $ 2,394 |  | $ 8,678
Increase to net cash provided by operating activities |  |  | 8,678 |
Increase to net cash used in financing activities |  |  | $ 8,678 |

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