Long-Term Debt - Additional Information (Details) - Jun. 30, 2015 - USD ($) |
Total |
|---|---|
| 6.085% Senior Notes | |
| Debt Instrument [Line Items] | |
| Maturity Date, Maximum | 2017 |
| Interest Rate Swap | |
| Debt Instrument [Line Items] | |
| Fixed rate debt | $ 100,000,000 |
| Interest Rate | 6.085% |
| Derivative description of variable rate basis | six-month LIBOR plus 3.422 |
| Maturity Date, Maximum | 2017 |
| Interest Rate Swap | London Interbank Offered Rate (LIBOR) [Member] | |
| Debt Instrument [Line Items] | |
| Debt, basis spread on variable rate | 3.422% |