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Employee benefit plans - Schedule of Aggregate Fair Value of Asset and Supplemental Asset Mix (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Defined Benefit Plan Disclosure [Line Items] |  |
CMRT asset value | $ 726.4 | $ 659.5
CMRT fair value input | 100.00% | 100.00%
CMRT asset mix | 100.00% | 100.00%
Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT fair value input | 82.00% | 82.00%
Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT fair value input | 1.00% | 1.00%
Level 3 Inputs [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT fair value input | 17.00% | 17.00%
Domestic Equities, Principally Publicly Traded [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT asset mix | 43.00% | 75.00%
International Equities, Publicly Traded [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT asset mix | 2.00% | 2.00%
Fixed Income Securities, Publicly Traded [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT asset mix | 12.00% | 14.00%
Privately Managed Limited Partnerships [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT asset mix | 8.00% | 8.00%
Other Assets [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT asset mix | 35.00% | 1.00%

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- Details
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- Definition Combined Master Retirement Trust Asset Value + References No definition available. + Details
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- Definition Percentage Of Combined Master Retirement Trust Asset Mix + References No definition available. + Details
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- Definition Percentage Of Combined Master Retirement Trust Fair Value Inputs + References No definition available. + Details
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