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Bonds Payable - Additional Information (Detail) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 29, 2017 USD ($) | Aug. 17, 2017 USD ($) | Aug. 17, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Jun. 26, 2014 CNY (¥)
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from issuance of bonds, net |  |  |  | $ 297,581 | ¥ 1,936,154,000 |
Bonds 6.875% Due 2017 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount | ¥ |  |  |  |  |  | ¥ 2,000,000,000
Debt instrument, stated rate |  |  |  |  |  | 6.875%
Bonds 7% Due 2020 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount | $ | $ 100,000 | $ 200,000 |  |  |  |
Debt instrument, stated rate | 7.00% | 7.00% |  |  |  |
Debt instrument, maturity date | Aug. 17, 2020 | Aug. 17, 2020 | Aug. 17, 2020 |  |  |
Debt instrument, frequency of periodic payment |  | Payable semi-annually in arrears on August 17 and February 17 in each year | Payable semi-annually in arrears on August 17 and February 17 in each year |  |  |
Debt instrument, premium price | 100.04 |  |  |  |  |
Debt instrument, effective yield | 6.98% |  |  |  |  |
Proceeds from issuance of bonds, net |  | $ 296,085 | ¥ 1,926,419,000 |  |  |

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