Stock-Based Compensation - Subsequent to the IPO - 2013 Omnibus Equity Incentive Plan - Additional Information (Detail) (USD $)
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3 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | |||||
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Sep. 30, 2014
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Sep. 30, 2014
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Sep. 30, 2014
Common Stock [Member]
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Dec. 31, 2013
Common Stock [Member]
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Sep. 30, 2014
Restricted Stock [Member]
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Sep. 30, 2014
Restricted Stock Units (RSUs) [Member]
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Sep. 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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Sep. 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 | ||||||||
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 |