Quarterly report pursuant to Section 13 or 15(d)

Dividends - (Narrative) (Detail)

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Dividends - (Narrative) (Detail) (USD $)
3 Months Ended 9 Months Ended 1 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Oct. 30, 2012
Subsequent Event [Member]
Stockholders Equity [Line Items]          
Paid cash dividends, per share     $ 0.08 $ 0.04  
Special dividend, per share     $ 0.47    
Dividends payable, date declared, day, month and year     Oct. 30, 2012    
Dividend declared per common share $ 0.08 $ 0.04 $ 0.24 $ 0.12 $ 0.08
Dividends payable, date to be paid, day, month and year     Dec. 03, 2012    
Dividends payable, date of record, day, month and year     Nov. 16, 2012