Earnings and Dividends per Share - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings And Dividends Per Share [Abstract]
Shares not included in computation of diluted Earning per share		62,500		62,500
Restricted stock awards participate in nonforfeitable dividend rights			1
Common Stock, dividends, per share, declared	$ 0.05		$ 0.06
Common Stock, dividends, per share, Paid	$ 0.05		$ 0.06