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Stock-Based Compensation - Subsequent to the IPO - 2013 Omnibus Equity Incentive Plan - Additional Information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended | ||||||||
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Jun. 30, 2014
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Jun. 30, 2014
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Jun. 30, 2014
Common Stock [Member]
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Dec. 31, 2013
Common Stock [Member]
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Jun. 30, 2014
Restricted Stock Units (RSUs) [Member]
Independent Contractors [Member]
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Jun. 30, 2014
Restricted Stock Units (RSUs) [Member]
Employees [Member]
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May 31, 2014
Restricted Stock [Member]
Non-employee directors [Member]
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Jun. 30, 2014
Restricted Stock [Member]
Non-employee directors [Member]
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Jun. 30, 2014
2013 Omnibus Equity Incentive Plan [Member]
Incentive_Plan
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Dec. 31, 2013
2013 Omnibus Equity Incentive Plan [Member]
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Feb. 28, 2014
2013 Omnibus Equity Incentive Plan [Member]
Restricted Stock Units (RSUs) [Member]
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May 31, 2014
2013 Omnibus Equity Incentive Plan [Member]
Restricted Stock Units (RSUs) [Member]
Independent Contractors [Member]
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Feb. 28, 2014
2013 Omnibus Equity Incentive Plan [Member]
Restricted Stock Units (RSUs) [Member]
Independent Contractors [Member]
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May 31, 2014
2013 Omnibus Equity Incentive Plan [Member]
Restricted Stock Units (RSUs) [Member]
Employees [Member]
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Jun. 30, 2014
2013 Omnibus Equity Incentive Plan [Member]
Deferred stock units [Member]
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| 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 | ||||||||||||