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Common Stock - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 1 Months Ended
Jul. 31, 2012
Jul. 23, 2012
Jul. 31, 2012
Shares Offered By Company
Jul. 31, 2012
Shares Offered By Selling Stockholders
Feb. 29, 2012
IPO
Feb. 29, 2012
IPO
Shares Offered By Company
Feb. 29, 2012
IPO
Shares Offered By Selling Stockholders
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