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New Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands, shares in Millions | 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] |  |  |  |
Realized tax benefit | $ 4,343 | $ 5,306 | $ 20,484 | $ 20,106
Accounting Standards Update 2016-09 [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Increase of diluted shares | 0.6 |  | 0.6 |
Realized tax benefit | $ (2,200) |  | $ (2,800) |

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