Subsequent Events - Additional Information (Detail) (USD $)	1 Months Ended	0 Months Ended
	Sep. 30, 2013	Oct. 16, 2013 Dividend Declared
Subsequent Event [Line Items]
Subsequent event description		The Board of Directors of the Company declared a quarterly dividend
Dividends declared per common share (in USD per share)	$ 0.45	$ 0.45
Dividend payable date		Dec. 18, 2013
Dividend record date		Dec. 04, 2013