Subsequent Events - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		0 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jul. 24, 2014 Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends declared per share	$ 0.10	$ 0.10	$ 0.20	$ 0.20	$ 0.10
Dividends declared, date			Jul. 24, 2014
Dividends declared, payable date			Aug. 25, 2014
Dividends declared, record date			Aug. 11, 2014