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 6 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Jun. 30, 2014
Common Stock [Member]
Dec. 31, 2013
Common Stock [Member]
Jun. 30, 2014
Restricted Stock Units (RSUs) [Member]
Independent Contractors [Member]
Jun. 30, 2014
Restricted Stock Units (RSUs) [Member]
Employees [Member]
May 31, 2014
Restricted Stock [Member]
Non-employee directors [Member]
Jun. 30, 2014
Restricted Stock [Member]
Non-employee directors [Member]
Jun. 30, 2014
2013 Omnibus Equity Incentive Plan [Member]
Incentive_Plan
Dec. 31, 2013
2013 Omnibus Equity Incentive Plan [Member]
Feb. 28, 2014
2013 Omnibus Equity Incentive Plan [Member]
Restricted Stock Units (RSUs) [Member]
May 31, 2014
2013 Omnibus Equity Incentive Plan [Member]
Restricted Stock Units (RSUs) [Member]
Independent Contractors [Member]
Feb. 28, 2014
2013 Omnibus Equity Incentive Plan [Member]
Restricted Stock Units (RSUs) [Member]
Independent Contractors [Member]
May 31, 2014
2013 Omnibus Equity Incentive Plan [Member]
Restricted Stock Units (RSUs) [Member]
Employees [Member]
Jun. 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            
Common stock shares reserved for issuance of awards                   5,500,000          
Common stock shares available for future grants                 2,237,587            
Restricted stock units granted during the period   109,277     79,402 6,991 22,884 22,884       41,314 38,088 6,991  
Share-based payment award vesting rights, percentage             33.33%         20.00% 20.00% 20.00%  
Restricted stock units granted during the period first vesting date                     Feb. 11, 2015        
Common stock price used for measurement to FMV for RSU awards to independent contractors     $ 25.51 $ 14.90                      
Fully vested deferred stock units 2,276,000 2,276,000                         2,275,747