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New Accounting Standards - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
ASU 2016-09 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Increase in provision for income taxes | $ 2.1 | $ 2.0 | $ 1.5

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- Details
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