Stock-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Stock-Based Compensation
Units available for future awards under 2013 Equity Incentive Plan (in units)	120,200,000	120,200,000
Compensation expense recorded during the period (in dollars)	$ 1,387	$ 1,932
Stock Options
Stock-Based Compensation
Compensation expense recorded during the period (in dollars)	593	791
Percentage of the award vesting at each of the three anniversaries		33.00%
Contractual term of the stock options		10 years
Expiration term, if employment or other association is terminated due to death or disability		1 year
Expiration term, if employment or other association is terminated due to other reason		3 months
Expected volatility (as a percent)		45.00%
Expected dividend (as a percent)		0.00%
Number of Stock Options:
Outstanding at beginning of period (in shares)	423,407,000
Granted (in shares)		423,407,000
Expired or canceled (in units)	253,000	253,000
Outstanding at end of period (in shares)	423,154,000	423,154,000
Weighted-average exercise price:
Outstanding at beginning of period (in dollars per share)	$ 21.03
Granted (in dollars per share)		$ 21.03
Expired or canceled (in dollars per share)	$ 21.03	$ 21.03
Outstanding at end of period (in dollars per share)	$ 21.03	$ 21.03
Weighted-average remaining contractual term:
Outstanding at end of period		9 years 8 months 12 days
Stock Options | Minimum
Stock-Based Compensation
Risk-free rate (as a percent)		0.03%
Weighted-average remaining contractual term:
Annualized grantee forfeiture rate (as a percent)		0.062
Stock Options | Maximum
Stock-Based Compensation
Risk-free rate (as a percent)		2.30%
Weighted-average remaining contractual term:
Annualized grantee forfeiture rate (as a percent)		0.192
Time-based RSUs
Stock-Based Compensation
Compensation expense recorded during the period (in dollars)	330	395
Percentage of the award vesting at each of the three anniversaries		33.00%
Number of units:
Outstanding at beginning of period (in units)	70,826,000
Granted (in units)	27,407,000	98,233,000
Expired or canceled (in units)	126,000	126,000
Outstanding at end of period (in units)	98,107,000	98,107,000
Weighted-Average Exercise Price:
Outstanding at beginning of period (in dollars per share)	$ 17.51
Granted (in dollars per share)	$ 19.37	$ 18.03
Expired or canceled (in dollars per share)	$ 17.51	$ 17.51
Outstanding at end of period (in dollars per share)	$ 18.03	$ 18.03
Unamortized compensation cost	979	979
Time-based RSUs | Minimum
Weighted-average remaining contractual term:
Turnover rates (as a percent)		0.062
Time-based RSUs | Maximum
Weighted-average remaining contractual term:
Turnover rates (as a percent)		0.192
Time-based RSUs | Class A Common Stock
Weighted-average remaining contractual term:
Number of share awarded for each RSU (in shares)		1
Performance-based RSUs
Stock-Based Compensation
Compensation expense recorded during the period (in dollars)	464	746
Expected volatility (as a percent)		45.00%
Expected dividend (as a percent)		0.00%
Number of units:
Outstanding at beginning of period (in units)	499,364,000
Granted (in units)		499,364,000
Expired or canceled (in units)	253,000	253,000
Outstanding at end of period (in units)	499,111,000	499,111,000
Weighted-Average Exercise Price:
Outstanding at beginning of period (in dollars per share)	$ 11.58
Granted (in dollars per share)		$ 11.58
Expired or canceled (in dollars per share)	$ 11.58	$ 11.58
Outstanding at end of period (in dollars per share)	$ 11.58	$ 11.58
Unamortized compensation cost	$ 3,816	$ 3,816
Performance-based RSUs | Minimum
Stock-Based Compensation
Risk-free rate (as a percent)		0.30%
Weighted-average remaining contractual term:
Annualized grantee forfeiture rate (as a percent)		0.062
Performance-based RSUs | Maximum
Stock-Based Compensation
Risk-free rate (as a percent)		2.30%
Weighted-average remaining contractual term:
Annualized grantee forfeiture rate (as a percent)		0.192