|
Long-term Debt (Detail) (USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2013
|
Dec. 31, 2012
|
|---|---|---|
| Debt Instrument [Line Items] | ||
| Credit facility | $ 335,000 | $ 162,000 |
| Senior notes | 400,000 | 400,000 |
| Unamortized premium on senior notes | 1,671 | 1,865 |
| Total long-term debt | $ 736,671 | $ 563,865 |