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Significant Accounting Policies - Additional Information (Detail) - USD ($) |  | 3 Months Ended
--- | --- | ---
Jan. 01, 2017 | Mar. 31, 2017 | Mar. 31, 2016
Subsidiary or Equity Method Investee [Line Items] |  |  |
Deferred income tax expense (benefits) |  | $ (3,200,000) | $ (3,200,000)
Other operating income |  |  | 800,000
China [Member] |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |
Other operating income |  | 0 | $ 800,000
Accounting Standards Update 2016-09 [Member] |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |
Deferred income tax expense (benefits) | $ (29,600,000) |  |
Excess tax benefits |  | $ 4,300,000 |

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