Earnings Per Share - Additional Information (Detail) (USD $)	0 Months Ended	1 Months Ended	12 Months Ended
	Aug. 26, 2011	Aug. 26, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 01, 2011
Class of Warrant or Right [Line Items]
Conversion price for the preferred stock	$ 12.00	$ 12.00	$ 12.00
Exercise price per share				$ 13.00	$ 13.00
Strike price of dilutive common shares for SAR				$ 22.07
Average closing market price of common stock excluded from diluted earning per share				$ 15.51
Estimated fair value per share of common stock					$ 9.55
Shares of common stock issuable upon exercise of the Roth Warrant						105,000
Private Placement Warrants [Member]
Class of Warrant or Right [Line Items]
Shares issued for warrants exercised			339,410	13,750
Roth Warrant [Member]
Class of Warrant or Right [Line Items]
Shares of common stock issuable upon exercise of the Roth Warrant						62,116