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Share-Based Compensation - Summary of Company's Employee Share Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 9 Months Ended 12 Months Ended
Oct. 22, 2013
May 27, 2013
Jul. 01, 2012
Dec. 19, 2011
Oct. 08, 2011
Aug. 01, 2011
May 06, 2011
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of options, Outstanding, Beginning balance               7,665,500 7,675,000  
Number of options, Granted 228,000 560,000           177,600    
Number of options, Exercised               (2,888,363)     
Number of options, Forfeited               (35,000) (797,500)  
Number of options, Outstanding, Ending balance               4,919,737 7,665,500 7,675,000
Number of options, Vested and expected to vest, Ending balance               4,806,777 7,620,600  
Number of options, Exercisable, Ending balance               2,200,537 3,330,000  
Weighted average exercise price, Outstanding, Beginning balance               $ 2.20 $ 2.20  
Weighted average exercise price, Granted $ 2.20 $ 2.20           $ 2.20    
Weighted average exercise price, Exercised               $ 2.20    
Weighted average exercise price, Forfeited               $ 2.20 $ 2.20  
Weighted average exercise price, Outstanding, Ending balance               $ 2.20 $ 2.20 $ 2.20
Weighted average exercise price, Vested or expected to vest               $ 2.20 $ 2.20  
Weighted average exercise price, Exercisable               $ 2.20 $ 2.20  
Weighted average grant date fair value, Outstanding, Beginning balance               $ 2.65 $ 2.38  
Weighted average grant date fair value, Granted   $ 3.03 $ 2.36 $ 2.41 $ 2.37 $ 2.18 $ 2.40 $ 34.57    
Weighted average grant date fair value, Outstanding, Ending balance $ 11.64 $ 4.58 $ 3.70 $ 3.68 $ 3.68 $ 3.44 $ 3.69 $ 3.76 $ 2.65 $ 2.38
Weighted average grant date fair value, Vested or expected to vest               $ 3.72 $ 2.64  
Weighted average grant date fair value, Exercisable               $ 2.51 $ 2.38  
Weighted average remaining contractual term               7 years 2 months 9 days 7 years 8 months 27 days 8 years 6 months 15 days
Weighted average remaining contractual term, Vested or expected to vest               7 years 2 months 5 days 7 years 8 months 23 days  
Weighted average remaining contractual term, Exercisable               6 years 10 months 10 days 7 years 5 months 19 days  
Aggregate intrinsic value of share options, Outstanding, Beginning balance               $ 263,617 $ 11,513  
Aggregate intrinsic value of share options, Outstanding, Ending balance               195,855 263,617 11,513
Aggregate intrinsic value of share options, Vested or expected to vest               191,358 262,072  
Aggregate intrinsic value of share options, Exercisable               $ 87,603 $ 114,519  
Minimum [Member]
                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Weighted average grant date fair value, Granted $ 9.63                  
Maximum [Member]
                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Weighted average grant date fair value, Granted $ 9.69