Subsequent Events - Additional Information (Detail) (USD $)			12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014 Scenario, Forecast [Member]	Dec. 31, 2013 Dividend Declared [Member]	Feb. 25, 2014 Dividend Declared [Member] Subsequent Event [Member]
Subsequent Event [Line Items]
Cash dividend per share	$ 0.08		$ 0.08	$ 0.12
Special cash dividend per share				$ 0.50
Date of payment to shareholders entitled to dividends			Mar. 28, 2014
Date of record of shareholders entitled to dividends			Mar. 14, 2014
Expected cash dividend per share		$ 0.48