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Other Noncurrent Assets - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Mar. 31, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Other Noncurrent Assets Disclosure [Line Items] |  |  |  |
Asset impairments |  |  | $ 14,942 | $ 0
Trademarks |  |  |  |
Other Noncurrent Assets Disclosure [Line Items] |  |  |  |
Asset impairments | $ 9,200 |  |  |
Fuhu Inc. and Sproutling Inc. |  |  |  |
Other Noncurrent Assets Disclosure [Line Items] |  |  |  |
Amortizable identifiable intangible assets acquired |  | $ 11,200 |  |

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