Stockholders' Equity - Additional Information (Detail) (USD $)	12 Months Ended			12 Months Ended		12 Months Ended
	Dec. 31, 2013 Directors	Feb. 15, 2013	Dec. 31, 2012	Dec. 31, 2013 Class B Common Stock [Member] Vote	Dec. 31, 2012 Class B Common Stock [Member]	Dec. 31, 2013 Common Stock [Member] Vote	Dec. 20, 2011 Common Stock [Member]
Equity [Line Items]
Preferred stock, shares authorized	100,000,000		100,000,000
Preferred stock, par value	$ 0.001		$ 0.001
Preferred stock, shares issued	0		0
Common stock, shares authorized	1,600,000,000		1,600,000,000	400,000,000	400,000,000	1,600,000,000
Common stock, par value	$ 0.001		$ 0.001	$ 0.001	$ 0.001	$ 0.001
Right to voting				10 votes per share		one vote per share
Vote per common share				10		1
Authorized Class B common stock shares				400,000,000
Common Stock Class B par value per share				$ 0.001
Percentage of directors elected by common stock holders	25.00%
Number of directors	3
Conversion of Class B common stock	1
Common stock, shares issued	131,537,798		130,060,138	12,799,999	12,799,999
Common stock, shares outstanding	129,417,089		130,060,138	12,799,999	12,799,999	120,661,020	120,661,020
Authorized the repurchase of shares of common stock		250,000,000
Common stock outstanding shares repurchased	2,120,709
Aggregate cost of shares repurchased, common stock	$ 145,221,000
Remaining authorized share repurchased amount	$ 104,800,000
Dividend declared on common stock	$ 0