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Schedule of Debt Outstanding (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Revolving Credit Facility maturity date | Dec. 31, 2017 |
Weighted average rate | 1.70% | 1.70%
Senior Notes interest payable dates | interest payable periodically at variable interest rates. |
Senior Notes 7.75% Due 2017 |  |
Debt Instrument [Line Items] |  |
Interest rate stated percentage of Senior Notes | 7.75% |
Note maturity date | Jun. 30, 2017 |
Senior Notes interest payable dates | interest payable semi-annually in June and December at 7.75%. |
Notes issued with a discount | 13.4 |
Notes, unamortized | 8.1 | 8.5

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