Quarterly report pursuant to Section 13 or 15(d)

Dividends - Additional Information (Detail)

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Dividends - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 1 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Nov. 06, 2013
Subsequent Event
Dividends Payable [Line Items]          
Paid cash dividends, per share     $ 0.26 $ 0.24  
Dividends declared per common share $ 0.09 $ 0.08 $ 0.26 $ 0.24 $ 0.10
Dividend payable, date declared, day month and year         Nov. 06, 2013
Dividends payable, date to be paid, day, month and year         Dec. 03, 2013
Dividends payable, date of record, day, month and year         Nov. 18, 2013