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Analysis of Allowance for Doubtful Debt (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Balance at beginning of the year | $ 12,436 | ¥ 80,910 | ¥ 40,070 |
Additional provision charged to expense | 5,752 | 37,427 | 117,564 | ¥ 32,199
Write-off of accounts receivable | (3,038) | (19,766) | (38,797) |
Provision included in disposed subsidiaries | (8,767) | (57,041) |  |
Balance at the end of the year | 11,321 | 73,656 | 80,910 | ¥ 40,070
Allowance for Account Receivables |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Additional provision charged to expense | $ 10,690 | ¥ 69,553 | ¥ 79,637 |

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