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Employee Benefit Plans - Schedule of Aggregate Fair Value of Asset and Supplemental Asset Mix (Detail) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Defined Benefit Plan Disclosure [Line Items] |  |
CMRT asset value | $ 648.8 | $ 715.5
CMRT fair value input | 100.00% | 100.00%
CMRT asset mix | 100.00% | 100.00%
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT fair value input | 54.00% | 67.00%
Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT fair value input | 27.00% | 13.00%
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT fair value input | 19.00% | 20.00%
Domestic Equities, Principally Publicly Traded |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT asset mix | 29.00% | 48.00%
International Equities, Principally Publicly Traded |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT asset mix | 22.00% | 11.00%
Fixed Income Securities, Principally Publicly Traded |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT asset mix | 38.00% | 32.00%
Privately Managed Limited Partnerships |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT asset mix | 5.00% | 7.00%
Hedge Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT asset mix | 5.00% |
Other, Primarily Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
CMRT asset mix | 1.00% | 2.00%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value of CMRT plan assets attributable to the defined benefit pension plans to which two or more participating affiliates contribute. + References No definition available. + Details
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- Definition Actual allocation percentage of CMRT plan assets according to the asset category (domestic equities, international equities, fixed income securities, privately managed limited partnerships, other). + References No definition available. + Details
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- Definition Actual allocation percentage of CMRT plan assets according to the fair value input level from the fair value hierarchy (Level I, Level 2 or Level 3). + References No definition available. + Details
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