Stockholder's Equity (Details) (USD $) | 3 Months Ended | 9 Months Ended | 1 Months Ended |
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2014 | Mar. 31, 2015 |
Stock-Based Compensation | | | | | |
Stock-based compensation expense (in dollars) | $1,300,000 | $1,500,000 | | | |
Common Class A | | | | | |
Equity Incentive Plans | | | | | |
Shares authorized for issuance | 4,000,000 | | | | 4,000,000 |
Employee and Directors Stock Options | | | | | |
Stock-Based Compensation | | | | | |
Unrecognized compensation cost related to non-vested stock options (in dollars) | 3,300,000 | | | | 3,300,000 |
Weighted-average periods over which unrecognized compensation cost recognized | 2 years 1 month 6 days | | | | |
Estimated forfeitures (as a percent) | 1.50% | | | | 1.50% |
Number of shares | | | | | |
Outstanding at the beginning of the period (in shares) | | 1,870,000 | | 1,870,000 | |
Granted (in shares) | | | | 65,000 | |
Outstanding at the end of the period (in shares) | | | 1,870,000 | 1,935,000 | |
Vested at the end of the period (in shares) | | | | 670,000 | |
Exercisable at the end of the period (in shares) | | | | 670,000 | |
Weighted-average exercise price | | | | | |
Outstanding at the beginning of the period (in dollars per share) | | $11.23 | | $11.23 | |
Granted (in dollars per share) | | | | $13.49 | |
Outstanding at the end of the period (in dollars per share) | | | $11.23 | $11.30 | |
Vested at the end of the period (in dollars per share) | | | | $11.07 | |
Exercisable at the end of the period (in dollars per share) | | | | $11.07 | |
Weighted-average remaining contractual term | | | | | |
Outstanding at the beginning of the period | | | 8 years 4 months 24 days | 8 years 2 months 12 days | |
Granted | | | | 6 years 10 months 24 days | |
Outstanding at the end of the period | | | 8 years 4 months 24 days | 8 years 2 months 12 days | |
Vested at the end of the period | | | | 7 years 10 months 24 days | |
Exercisable at the end of the period | | | | 7 years 10 months 24 days | |
Aggregate intrinsic value | | | | | |
Outstanding at the beginning of the period (in dollars) | | 4,721,000 | | 4,721,000 | |
Outstanding at the end of the period (in dollars) | | | 4,721,000 | 3,423,000 | |
Vested at the end of the period (in dollars) | | | | 1,315,000 | |
Exercisable at the end of the period (in dollars) | | | | 1,315,000 | |
Weighted average grant date fair value of options granted (in dollars per share) | $4.48 | | | | |
Valuation assumptions | | | | | |
Dividend yield (as a percent) | 0.00% | | | | |
Restricted Stock | | | | | |
Stock-Based Compensation | | | | | |
Unrecognized compensation cost related to non-vested restricted stock (in dollars) | $2,800,000 | | | | $2,800,000 |
Weighted-average periods over which unrecognized compensation cost recognized | 1 year 1 month 6 days | | | | |
Number of shares | | | | | |
Outstanding at the beginning of the period (in shares) | 719,000 | | | | |
Outstanding at the end of the period (in shares) | 719,000 | | | | 719,000 |
Weighted-average grant date fair value | | | | | |
Outstanding at the beginning of the period (in dollars per share) | $9.82 | | | | |
Outstanding at the end of the period (in dollars per share) | $9.82 | | | | $9.82 |
Restricted Stock | Common Class A | | | | | |
Equity Incentive Plans | | | | | |
Shares available for issuance | 900,000 | | | | 900,000 |
Time Based Restricted Stock and Stock Option | | | | | |
Equity Incentive Plans | | | | | |
Number of equal annual installments for vesting of awards | 3 | | | | 3 |
Time Based Stock Option | Black Scholes Pricing Model | | | | | |
Valuation assumptions | | | | | |
Risk-free interest rate, minimum (as a percent) | 1.77% | 1.76% | | 1.77% | |
Risk-free interest rate, maximum (as a percent) | 2.12% | 1.92% | | | |
Volatility, minimum (as a percent) | 27.50% | 28.40% | | | |
Volatility, maximum (as a percent) | 29.50% | 30.90% | | | |
Weighted-average expected term | 6 years 10 months 24 days | | | | |
Time Based Stock Option | Minimum | Black Scholes Pricing Model | | | | | |
Valuation assumptions | | | | | |
Weighted-average expected term | | 6 years | | 0 years | |
Time Based Stock Option | Maximum | Black Scholes Pricing Model | | | | | |
Valuation assumptions | | | | | |
Weighted-average expected term | | 6 years 3 months 18 days | | | |
Time Based Restricted Stock | | | | | |
Valuation assumptions | | | | | |
Vesting period | | | | 3 years | |
Event Based Restricted Stock and Stock Option | Common Class A | | | | | |
Equity Incentive Plans | | | | | |
Closing price per share to be attained for vesting of awards to begin (in dollars per share) | | | | | $15 |
Event Based Restricted Stock and Stock Option | Common Class A | Minimum | | | | | |
Equity Incentive Plans | | | | | |
Number of trading days on which the closing price per share should attain the specified price per share for vesting of awards to begin | 10 | | | | 10 |
Event Based Stock Option | | | | | |
Aggregate intrinsic value | | | | | |
Unvested options | 300,000 | | | | 300,000 |
Event Based Restricted Stock | | | | | |
Number of shares | | | | | |
Outstanding at the end of the period (in shares) | 200,000 | | | | 200,000 |