Stockholders' Equity - Additional Information (Detail) (USD $)	1 Months Ended		12 Months Ended					0 Months Ended	1 Months Ended			1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended				1 Months Ended
	Feb. 29, 2012	Oct. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2008 Fund	Dec. 27, 2012	Feb. 27, 2014 Subsequent Event [Member]	Jan. 31, 2014 Subsequent Event [Member]	Dec. 31, 2013 Common Stock Voting [Member]	Dec. 31, 2012 Common Stock Voting [Member]	Nov. 30, 2011 Warrant [Member]	Dec. 31, 2008 Warrant [Member]	Feb. 29, 2012 Common Stock Non-Voting [Member]	Dec. 31, 2012 Common Stock Non-Voting [Member]	Dec. 31, 2013 Common Stock Non-Voting [Member]	Dec. 31, 2013 Common Stock Non-Voting [Member]	Dec. 31, 2012 Common Stock Non-Voting [Member]	Jan. 31, 2011 Series B Preferred Stock [Member]	Dec. 31, 2008 Series B Preferred Stock [Member]
Class of Stock [Line Items]
Common stock, shares authorized										110,000,000	110,000,000				10,000,000	10,000,000	10,000,000	10,000,000
Common stock entitles			One
Authorized a share repurchase program		$ 35,000,000							$ 35,000,000
Common stock shares repurchased		955,342
Cost of common stock shares repurchased		29,200,000			6,935,000
Share repurchase program expiration date			Jan. 01, 2014
Non-voting common stock repurchased	1,821,730													1,821,730
Cost of non-voting common stock repurchased				75,133,000										52,900,000	7,000
Conversion of non voting common stock to voting common stock	763,924
Securities purchase agreement funds managed						2
Series B Preferred Stock, shares authorized																				35,000
Shares of common stock													3,500,000						3,499,999
Warrants to purchase shares, common stock						700,000
Common stock at an exercise price						10.00
Aggregate purchase price						35,000,000
Placement agent fee and legal fees						33,500,000
Shares conversion price						$ 10.00
Closing price of the common stock						$ 17.50
Consecutive trading days						65 days
Common stock, shares issued												455,465
Special dividend paid							$ 1.30
Quarterly cash dividend			$ 0.52	$ 1.74	$ 0.36			$ 0.16