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Share-Based Compensation - Additional Information (Detail)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 12 Months Ended
Oct. 22, 2013
USD ($)
May 27, 2013
USD ($)
Sep. 30, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2013
CNY
Sep. 30, 2014
CNY
Dec. 31, 2012
Sep. 30, 2014
Class A Ordinary Shares [Member]
USD ($)
Dec. 31, 2013
Class A Ordinary Shares [Member]
USD ($)
Sep. 30, 2014
Employee Stock Option [Member]
May 4, 2011 [Member]
Maximum [Member]
Dec. 31, 2013
Employee Stock Option [Member]
May 4, 2011 [Member]
Maximum [Member]
Sep. 30, 2014
Employee Stock Option [Member]
November 4, 2013 [Member]
Maximum [Member]
Dec. 31, 2013
Employee Stock Option [Member]
November 4, 2013 [Member]
Maximum [Member]
Sep. 30, 2014
Restricted Shares [Member]
USD ($)
Sep. 30, 2014
Restricted Shares [Member]
CNY
Dec. 31, 2013
Restricted Shares [Member]
USD ($)
Dec. 31, 2013
Restricted Shares [Member]
CNY
Dec. 31, 2013
Restricted Shares [Member]
Scenario, Previously Reported [Member]
USD ($)
Dec. 31, 2013
Restricted Shares [Member]
Scenario, Previously Reported [Member]
CNY
May 06, 2011
2011 Plan [Member]
Employee Stock Option [Member]
May 6, 2011 [Member]
Directors and Employees [Member]
USD ($)
Dec. 31, 2013
2011 Plan [Member]
Employee Stock Option [Member]
May 6, 2011 [Member]
Directors and Employees [Member]
Aug. 01, 2011
2011 Plan [Member]
Employee Stock Option [Member]
August 1, 2011 [Member]
Employees [Member]
USD ($)
Dec. 31, 2013
2011 Plan [Member]
Employee Stock Option [Member]
August 1, 2011 [Member]
Employees [Member]
Oct. 08, 2011
2011 Plan [Member]
Employee Stock Option [Member]
October 8, 2011 [Member]
Employees [Member]
USD ($)
Dec. 31, 2013
2011 Plan [Member]
Employee Stock Option [Member]
October 8, 2011 [Member]
Employees [Member]
Dec. 19, 2011
2011 Plan [Member]
Employee Stock Option [Member]
December 19, 2011 [Member]
Employees [Member]
USD ($)
Dec. 31, 2013
2011 Plan [Member]
Employee Stock Option [Member]
December 19, 2011 [Member]
Employees [Member]
Jul. 01, 2012
2011 Plan [Member]
Employee Stock Option [Member]
July 1, 2012 [Member]
Employees [Member]
USD ($)
Dec. 31, 2013
2011 Plan [Member]
Employee Stock Option [Member]
July 1, 2012 [Member]
Employees [Member]
May 27, 2013
2011 Plan [Member]
Employee Stock Option [Member]
May 27, 2013 [Member]
Employees [Member]
USD ($)
Dec. 31, 2013
2011 Plan [Member]
Employee Stock Option [Member]
May 27, 2013 [Member]
Employees [Member]
Oct. 22, 2013
2011 Plan [Member]
Employee Stock Option [Member]
October 22, 2013 [Member]
Employees [Member]
USD ($)
Dec. 31, 2013
2011 Plan [Member]
Employee Stock Option [Member]
October 22, 2013 [Member]
Employees [Member]
Oct. 22, 2013
2011 Plan [Member]
Employee Stock Option [Member]
October 22, 2013 [Member]
Employees [Member]
Vesting Period From January 1, 2014 to January 1, 2017 [Member]
Oct. 22, 2013
2011 Plan [Member]
Employee Stock Option [Member]
October 22, 2013 [Member]
Employees [Member]
Vesting Period From July 1, 2014 to July 1, 2017 [Member]
Jan. 16, 2014
2011 Plan [Member]
Employee Stock Option [Member]
January 16,2014 [Member]
Employees [Member]
USD ($)
Sep. 30, 2014
2011 Plan [Member]
Employee Stock Option [Member]
January 16,2014 [Member]
Employees [Member]
Jan. 16, 2014
2011 Plan [Member]
Employee Stock Option [Member]
January 16,2014 [Member]
Employees [Member]
Vesting Period From January 16, 2014 To January 16, 2017 [Member]
Jan. 16, 2014
2011 Plan [Member]
Employee Stock Option [Member]
January 16,2014 [Member]
Employees [Member]
Vesting Period From January 1, 2015 To January 1, 2018 [Member]
May 08, 2014
2013 Plan [Member]
Restricted Shares [Member]
Employees [Member]
Sep. 30, 2014
2013 Plan [Member]
Restricted Shares [Member]
Employees [Member]
Tranches
Nov. 04, 2013
2013 Plan [Member]
Restricted Shares [Member]
November 4, 2013 [Member]
Senior Executive [Member]
Dec. 31, 2013
2013 Plan [Member]
Restricted Shares [Member]
November 4, 2013 [Member]
Senior Executive [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                                      
Share based awards grant to employees, directors and consultants to purchase aggregate ordinary shares                   7,843,100 7,843,100 3,350,000 3,350,000                                                            
Number of options, Granted 228,000 560,000 177,600                                 4,950,000   700,000   110,000   2,000,000   120,000   560,000   228,000   78,000 150,000 177,600   57,600 120,000     400,000  
Weighted average exercise price, Granted $ 2.20 $ 2.20 $ 2.20                                 $ 2.20   $ 2.20   $ 2.20   $ 2.20   $ 2.20   $ 2.20   $ 2.20       $ 2.20              
Contractual term                                       10 years   10 years   10 years   10 years   10 years   10 years   10 years       10 years              
Award vesting period                                         44-month period, with 25% of the awards vesting on January 1, 2012 and the remainder of the awards vesting on an annual basis each January 1, thereafter.   41-month period, with 25% of the awards vesting on January 1, 2012 and the remainder of the awards vesting on an annual basis each January 1, thereafter.   39-month period, with 25% of the awards vesting on January 1, 2012 and the remainder of the awards vesting on an annual basis each January 1, thereafter.   49-month period, with 25% of the awards vesting on January 1, 2013 and the remainder of the awards vesting on an annual basis each January 1, thereafter.   48-month period, with 25% of the awards vesting on July 1, 2013 and the remainder of the awards vesting on an annual basis each July 1, thereafter.   44-month period, with 25% of the awards vesting on January 1, 2014 and the remainder of the awards vesting on an annual basis each January 1, thereafter.   January 1, 2014 to January 1, 2017, with 25% of the awards vesting on January 1, 2014 and the remainder of the awards vesting on an annual basis each January 1, thereafter; and 150,000 options will vest over a period from July 1, 2014 to July 1, 2017, with 25% of the awards vesting on July 1, 2014 and the remainder of the awards vesting on an annual basis each July 1, thereafter.       January 16, 2014 to January 16, 2017, with 25% of the awards vesting on January 16, 2014 and the remainder of the awards vesting on an annual basis each January 16, thereafter; and 120,000 options will vest over a period from January 1, 2015 to January 1, 2018, with 25% of the awards vesting on January 1, 2015 and the remainder of the awards vesting on an annual basis each January 1, thereafter.       All five tranches will vest over a period of four years, with 25% of the awards vesting on various dates ranging from March 14, 2015 to May 13, 2015, with the remainder of the awards vesting on an annual basis thereafter.   September 29, 2014 to September 29, 2017, with 25% of the awards vesting on September 29, 2014 and the remainder of the awards vesting on an annual basis each September 29, thereafter.
Vesting period                                       44 months   41 months   39 months   49 months   48 months   44 months                   4 years      
Percentage of awards vesting                                       25.00%   25.00%   25.00%   25.00%   25.00%   25.00%       25.00% 25.00%     25.00% 25.00%   25.00% 25.00%  
Share-based awards, ordinary shares outstanding     4,919,737 7,665,500 7,665,500   7,675,000 5,319,737 8,065,500                                                                    
Ordinary shares available for future grant               2,885,000 3,127,600                                                                    
Closing stock price               $ 42.01 $ 36.59                                                                    
Aggregate fair value of outstanding options at the grant date     $ 18,487 $ 20,349 123,184 113,474                                                                          
Unrecognized compensation expense     9,168 8,628 52,234 56,272               6,189 37,986     4,795 29,024                                                
Unvested options/restricted shares expected to be recognized over a weighted-average period     2 years 4 months 21 days 1 year 4 months 21 days 1 year 4 months 21 days                 3 years 2 months 16 days 3 years 2 months 16 days     3 years 9 months 3 years 9 months                                                
Aggregate fair value of restricted shares                           $ 6,614 40,597 $ 4,952 29,978                                                    
Weighted average grant date fair value, Granted                           $ 29.00   $ 12.38                                                      
Number of shares, Granted                           100,000 100,000 400,000 400,000                                             100,000      
Number of tranches                                                                                 5