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Subsequent Events - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jul. 26, 2013
Subsequent Events [Member]
Dividends Payable [Line Items]          
Quarterly dividend payable amount per share $ 0.11 $ 0.11 $ 0.22 $ 0.22 $ 0.11
Date of payment of dividend         Aug. 23, 2013
Date of record of dividend         Aug. 09, 2013
Date of announcement of dividend         Jul. 26, 2013