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Ordinary Shares - Additional Information (Detail)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 0 Months Ended
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