Subsequent Events - Additional Information (Detail) (USD $)	0 Months Ended			9 Months Ended
	Aug. 06, 2014	May 07, 2014	Feb. 12, 2014	Sep. 30, 2014
Subsequent Events [Abstract]
Cash dividend declared, Common stock	$ 0.10	$ 0.10	$ 0.10	$ 0.10
Common stock dividends payable, date declared				Nov. 05, 2014
Common stock dividends payable, date to be paid				Dec. 05, 2014
Common stock dividends payable, date of record				Nov. 17, 2014