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 9 Months Ended 1 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Oct. 25, 2013
Subsequent Event [Member]
Subsequent Event [Line Items]          
Dividends declared per share $ 0.10 $ 0.10 $ 0.30 $ 0.30 $ 0.10
Dividends declared, date         Oct. 25, 2013
Dividends declared, payable date         Nov. 27, 2013
Dividends declared, record date         Nov. 12, 2013