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Goodwill - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2016 | Dec. 31, 2016
Sproutling Inc. |  |
Business Acquisition [Line Items] |  |
Consideration paid for business acquisition | $ 9.9 |
Duration of contingent consideration agreement | 3 years |
Fuhu Inc. |  |
Business Acquisition [Line Items] |  |
Consideration paid for business acquisition | $ 23.3 |
Fuhu Inc. and Sproutling Inc. |  |
Business Acquisition [Line Items] |  |
Integration costs recognized |  | $ 2.0

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