Stockholders' Equity - Additional Information (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Feb. 15, 2013
Class Of Stock [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
Common stock, par value	$ 0.001	$ 0.001
Percentage of directors elected by common stock holders	25.00%
Number of directors	3
Conversion of Class B common stock	1.00
Common stock, shares issued	131,972,013	131,537,798
Common stock, shares outstanding	129,851,304	129,417,089
Class B Common Stock
Class Of Stock [Line Items]
Common stock, shares authorized	400,000,000	400,000,000
Common stock, par value	$ 0.001	$ 0.001
Authorized Class B common stock shares	400,000,000
Common Stock Class B par value per share	$ 0.001
Vote per common share	10
Right to voting	10 votes per share
Common stock, shares issued	12,799,999	12,799,999
Common stock, shares outstanding	12,799,999	12,799,999
Preferred Stock
Class Of Stock [Line Items]
Preferred stock, shares authorized	100,000,000
Preferred stock, par value	$ 0.001
Preferred stock, shares issued	0
Common Stock
Class Of Stock [Line Items]
Common stock, shares authorized	1,600,000,000
Common stock, par value	$ 0.001
Vote per common share	1
Right to voting	one vote per share
Common stock, shares issued	131,972,013	131,537,798
Common stock, shares outstanding	129,851,304
Dividend declared on common stock	$ 0
Treasury Stock
Class Of Stock [Line Items]
Common stock, shares issued	(2,120,709)	(2,120,709)
Authorized the repurchase of shares of common stock			250,000,000
Common stock outstanding shares repurchased	2,120,709
Remaining authorized share repurchased amount	$ 105