Stockholders' Equity - Additional Information (Detail) (USD $)	0 Months Ended			12 Months Ended
	Oct. 24, 2013	Sep. 25, 2013	Aug. 03, 2012	Dec. 31, 2013	Dec. 31, 2012	Sep. 23, 2013	Apr. 30, 2007
Equity [Abstract]
Common stock's purchase under tender offer		6,500,000
Percentage of purchase of shares under tender offer as to common stock issued and outstanding		16.79%
Price of per share of common stock		$ 5.00
Last sale price of the Company's common stock						$ 4.79
Common stock repurchased, shares	7,100,565			2,610,279	95,940
Value Of Shares Repurchased Without Fees	$ 35,500,000
Value Of Shares Repurchased	35,600,000			12,409,000	467,000
Repurchase of stock cost of repurchase of stock	100,000			140,000
Period of expiration of tender offer				Oct. 24, 2013
Reserved common stock for options outstanding				8,978,982
Common stock repurchase amount			20,000,000
Remaining common stock repurchase amount				$ 0
Preferred stock, shares authorized				5,000,000	5,000,000		5,000,000
Preferred share par value							$ 0.001
Preferred stock, shares issued				0	0