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Common Stock - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified |
1 Months Ended | 1 Months Ended | |||||
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Jul. 31, 2012
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Jul. 23, 2012
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Jul. 31, 2012
Shares Offered By Company
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Jul. 31, 2012
Shares Offered By Selling Stockholders
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Feb. 29, 2012
IPO
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Feb. 29, 2012
IPO
Shares Offered By Company
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Feb. 29, 2012
IPO
Shares Offered By Selling Stockholders
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| Class of Stock [Line Items] | |||||||
| Common stock sold | 9,775,000 | 3,625,000 | 6,150,000 | 10,906,941 | 10,422,645 | 484,296 | |
| Selling price per share | $ 15.40 | $ 12 | |||||
| Gross proceeds raised from the sale of common stock | $ 55.8 | $ 125.1 | |||||
| Net proceeds from the sale of our common stock | 51.9 | 112.8 | |||||
| Underwriting discounts and commissions | 2.7 | 8.8 | |||||
| Other offering expenses | $ 1.2 | $ 3.5 | |||||