Stockholders' Equity (Details) (USD $)	12 Months Ended
	Dec. 31, 2013 vote	Dec. 31, 2012	Dec. 31, 2011
Class A Common Stock
Class of Stock [Line Items]
Shares authorized	200,000,000	200,000,000
Par value per share	$ 0.0003	$ 0.0003
Number of votes per share	1
Number of shares of Class A Common Shares issued per share upon conversion	1,300,000	1,200,000	2,500,000
Class B Convertible Common Stock
Class of Stock [Line Items]
Shares authorized	20,000,000	21,300,000
Par value per share	$ 0.0003	$ 0.0003
Number of votes per share	10
Number of shares of Class A Common Shares issued per share upon conversion	(1,300,000)	(1,200,000)	(2,500,000)
Class A Common Stock And Class B Convertible Common Stock
Class of Stock [Line Items]
Class B Convertible Common Stock converted to Class A Common Stock, ratio	one-for-one
Maximum | Class A Common Stock And Class B Convertible Common Stock
Class of Stock [Line Items]
Beneficial ownership percentage of CEO	15.00%