Quarterly report pursuant to Section 13 or 15(d)

Subsequent Events - Additional Information (Detail)

v2.4.0.8
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. 25, 2013
Subsequent Event
Subsequent Event [Line Items]          
Dividends declared per share $ 0.10 $ 0.10 $ 0.20 $ 0.20 $ 0.10
Dividends declared, date         Jul. 25, 2013
Dividends declared, payable date         Aug. 28, 2013
Dividends declared, record date         Aug. 10, 2013