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Stockholders' Equity - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
1 Months Ended 3 Months Ended
Mar. 31, 2014
Mar. 31, 2014
Mar. 31, 2013
Stockholders Equity Note [Line Items]      
Proceeds from sale of common stock $ 196,800 $ 198,042 $ 208
Share of common stock issued 7,360,000    
Underwriter
     
Stockholders Equity Note [Line Items]      
Share of common stock issued 960,000