Quarterly report pursuant to Section 13 or 15(d)

Stockholder's Equity - Summary of Dividends Declared by Board of Directors (Detail)

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Stockholder's Equity - Summary of Dividends Declared by Board of Directors (Detail) (USD $)
9 Months Ended
Sep. 30, 2013
8/20/13 Record Date [Member]
 
Schedule Of Dividends Declared And Paid [Line Items]  
Announced Date Aug. 08, 2013
Record Date Aug. 20, 2013
Pay Date Aug. 29, 2013
Amount per share $ 0.06
11/18/13 Record Date [Member]
 
Schedule Of Dividends Declared And Paid [Line Items]  
Announced Date Nov. 07, 2013
Record Date Nov. 18, 2013
Pay Date Nov. 22, 2013
Amount per share $ 0.14