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Accumulated Other Comprehensive (Loss) Income - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount reclassified to earnings from the change in fair value of derivatives component of accumulated other comprehensive income | $ 3.1 | $ 5.1 | $ 6.2
Estimated reclassification of change in fair value of derivatives component of accumulated other comprehensive (loss) income to earning during the next twelve months | (2.6) |  |
Amounts expected to be recognized as components of net periodic benefit costs, net actuarial loss | 7.8 |  |
Amounts expected to be recognized as components of net periodic benefit costs, net prior service credit | $ (0.4) |  |

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