Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Subsequent to the IPO - 2013 Omnibus Equity Incentive Plan - Additional Information (Detail)

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Stock-Based Compensation - Subsequent to the IPO - 2013 Omnibus Equity Incentive Plan - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Sep. 30, 2014
Common Stock [Member]
Dec. 31, 2013
Common Stock [Member]
Sep. 30, 2014
Restricted Stock [Member]
Sep. 30, 2014
Restricted Stock Units (RSUs) [Member]
Sep. 30, 2014
2013 Omnibus Equity Incentive Plan [Member]
Incentive_Plan
Dec. 31, 2013
2013 Omnibus Equity Incentive Plan [Member]
Sep. 30, 2014
2013 Omnibus Equity Incentive Plan [Member]
Deferred stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of active equity plans             1    
Vesting period for restricted stock awards and restricted stock units         3 years 5 years      
Common stock shares reserved for issuance of awards               5,500,000  
Common stock shares available for future grants             2,230,999    
Common stock price used for measurement to FMV for RSU awards to independent contractors     $ 30.26 $ 14.90          
Fully vested deferred stock units 2,276,000 2,276,000             2,275,747