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New Accounting Standards - Additional Information (Detail) - Accounting Standards Update 2016-09 $ in Millions | 12 Months Ended
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Dec. 31, 2016 USD ($)
New Accounting Pronouncement Early Adoption [Line Items] |
Recognition of an excess tax deficiency in provision for income taxes rather than paid-in capital | $ 2.1
Cumulative-effect adjustments to retained earnings (deficit) and reduced deferred tax liability | $ 101.1

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