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Stockholders' Equity - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified |
3 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Dec. 31, 2013
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Jul. 12, 2013
Class A Common Stock
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Jul. 02, 2013
Class A Common Stock
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Sep. 30, 2014
Class A Common Stock
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Sep. 30, 2013
Class A Common Stock
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Dec. 31, 2013
Class A Common Stock
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May 31, 2014
Class B Common Stock
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Feb. 28, 2014
Class B Common Stock
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Sep. 30, 2014
Class B Common Stock
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Dec. 31, 2013
Class B Common Stock
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Nov. 30, 2013
Death of Chief Executive Officer
Class B Common Stock
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May 31, 2014
Resignation of Partner
Class B Common Stock
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Sep. 30, 2014
Resale and Registration Rights Agreement
Class B Common Stock
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Sep. 30, 2014
Resale and Registration Rights Agreement
Class B Common Stock
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Sep. 30, 2014
Slp
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Sep. 30, 2013
Slp
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| Class Of Stock [Line Items] | ||||||||||||||||||||
| Partnership distributions, amount | $ 1,248 | $ 1,427 | $ 5,244 | $ 29,327 | ||||||||||||||||
| Amount distributed to existing partners | 10,000 | |||||||||||||||||||
| Distributions of partner incentive allocations of net income | 14,206 | 12,104 | ||||||||||||||||||
| Accrued partner incentive allocations | 15,572 | 15,572 | 17,424 | 13,062 | 3,175 | |||||||||||||||
| Issuance of Class A shares in IPO, Shares | 718,603 | 4,790,684 | 5,509,000 | 261,958 | 261,958 | |||||||||||||||
| Exchange of Class B common stock for Class A common stock | 2,013,677 | 1,297 | 133,739 | |||||||||||||||||
| Common stock repurchased/surrendered and cancelled | 5,893 | 16,530 | 16,530 | |||||||||||||||||
| Common stock, par value | $ 0.01 | $ 0.01 | $ 17.73 | $ 14.50 | $ 0.01 | $ 0.01 | ||||||||||||||
| Common stock surrendered in settlement of an outstanding note receivable | 4,596 | |||||||||||||||||||
| Common stock surrendered in settlement of an outstanding note receivable, value | $ 81 | |||||||||||||||||||
| Exchange of Class B common stock for Class A common stock | 1,000 | (136) | 133,739 | (133,739) | ||||||||||||||||