|
Schedule of Debt Outstanding (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified |
9 Months Ended | 9 Months Ended | 9 Months Ended | |||||
|---|---|---|---|---|---|---|---|---|
|
Sep. 30, 2012
Revolving Credit Facility
|
Dec. 31, 2011
Revolving Credit Facility
|
Sep. 30, 2012
Senior Notes 6.25% Due 2013
|
Sep. 30, 2012
Senior Notes 6.75% Due 2014
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Jul. 31, 2012
Senior Notes 6.75% Due 2014
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Jun. 30, 2012
Senior Notes 6.75% Due 2014
|
Sep. 30, 2012
Senior Notes 7.75% Due 2017
|
Dec. 31, 2011
Senior Notes 7.75% Due 2017
|
|
| Debt Instrument [Line Items] | ||||||||
| Interest rate stated percentage of Senior Notes | 6.25% | 6.75% | 7.75% | |||||
| Revolving Credit Facility maturity date | Dec. 31, 2016 | |||||||
| Note maturity date | Mar. 15, 2013 | Jan. 31, 2014 | Jun. 01, 2017 | |||||
| Weighted average rate | 1.70% | 1.00% | ||||||
| Senior Notes interest payable dates | interest payable periodically at variable interest rates | interest payable semi-annually in March and September at 6.25%. | interest payable semi-annually in January and July at 6.75%. | interest payable semi-annually in June and December at 7.75%. | ||||
| Notes issued with a discount | $ 13.4 | |||||||
| Redeemable aggregate principal amount | 50.0 | 60.0 | ||||||
| Notes, unamortized | $ 8.8 | $ 10.0 | ||||||