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Ordinary Shares - Additional Information (Detail) In Thousands, except Share data, unless otherwise specified | 12 Months Ended |  |  |  |  |  |  |  |  | 0 Months Ended |  |  |  |  |
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Dec. 31, 2013 USD ($) | Dec. 31, 2013 CNY | Dec. 11, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Telstra Holdings Pty Ltd. [Member] | Jun. 27, 2008 Telstra Holdings Pty Ltd. [Member] | Jun. 23, 2008 Telstra Holdings Pty Ltd. [Member] | Dec. 31, 2013 Telstra Holdings Pty Ltd. [Member] Maximum [Member] | Dec. 31, 2013 Telstra Holdings Pty Ltd. [Member] Minimum [Member] | Dec. 11, 2013 Class A Ordinary Shares [Member] | Dec. 31, 2013 Class A Ordinary Shares [Member] Prior to the Completion of the IPO on December 11, 2013 [Member] | Dec. 11, 2013 Class A Ordinary Shares [Member] IPO [Member] | Dec. 11, 2013 Class B Ordinary Shares [Member] | Dec. 31, 2013 Class B Ordinary Shares [Member] Prior to the Completion of the IPO on December 11, 2013 [Member] | Dec. 11, 2013 Class B Ordinary Shares [Member] IPO [Member] | Dec. 31, 2013 West Crest Limited [Member] USD ($) | Dec. 31, 2013 West Crest Limited [Member] CNY | Nov. 18, 2013 Three-Month Revolving Loan Facility [Member] USD ($) | Nov. 18, 2013 Three-Month Revolving Loan Facility [Member] CNY
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retire date | Nov. 15, 2013 | Nov. 15, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
A three-month revolving loan facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38,000 | 230,040
Draw down date | Nov. 21, 2013 | Nov. 21, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash deposits to collateralized loan amount | 40,471 | 245,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,471 | 245,000
Payable for repurchase of common stock | $ 37,500 | 227,015 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 37,500 | 227,015 |  |
Percentage of the Company owned by Telstra |  |  |  |  | 65.40% | 55.00% | 100.00% | 51.00% | 39.30% |  |  |  |  |  |  |  |  |  |
Number of ordinary shares outstanding |  |  | 105,136,436 | 100,000,000 |  |  |  |  |  | 36,347,496 | 27,354,496 | 36,347,496 | 68,788,940 | 68,788,940 | 68,788,940 |  |  |  |
Newly issued shares offered through IPO |  |  |  |  |  |  |  |  |  |  |  | 8,993,000 |  |  |  |  |  |  |

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