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Organization and Principal Activities - VIE Arrangements (Parenthetical) (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥)
--- | --- | --- | ---
Variable Interest Entity [Line Items] |  |  |
Total current liabilities | ¥ 2,165,754 | $ 332,870 | ¥ 2,066,221
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Total current liabilities | 523,545 | 80,468 | 553,554
Due to Subsidiaries | Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] | Subsidiaries [Member] |  |  |
Variable Interest Entity [Line Items] |  |  |
Total current liabilities | ¥ 390,139 | $ 59,963 | ¥ 413,067

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