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Employee Benefit Plans - Schedule of Aggregate Fair Value of Asset and Supplemental Asset Mix (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Combined Master Retirement Trust Asset [Line Items] |  |
CMRT asset value | $ 637.8 | $ 648.8
CMRT assets comprised of: |  |
Assets not subject to fair value hierarchy | 30.00% | 30.00%
Assets subject to fair value hierarchy: |  |
Fair value input | 100.00% | 100.00%
CMRT asset mix: |  |
Percentage of combined master retirement trust asset mix | 100.00% | 100.00%
Domestic equities, principally publicly traded |  |
CMRT asset mix: |  |
Percentage of combined master retirement trust asset mix | 31.00% | 29.00%
International equities, principally publicly traded |  |
CMRT asset mix: |  |
Percentage of combined master retirement trust asset mix | 22.00% | 22.00%
Fixed income securities, principally publicly traded |  |
CMRT asset mix: |  |
Percentage of combined master retirement trust asset mix | 36.00% | 38.00%
Privately managed limited partnerships |  |
CMRT asset mix: |  |
Percentage of combined master retirement trust asset mix | 5.00% | 5.00%
Hedge funds |  |
CMRT asset mix: |  |
Percentage of combined master retirement trust asset mix | 5.00% | 5.00%
Other, primarily cash |  |
CMRT asset mix: |  |
Percentage of combined master retirement trust asset mix | 1.00% | 1.00%
Level 1 |  |
Assets subject to fair value hierarchy: |  |
Fair value input | 54.00% | 54.00%
Level 2 |  |
Assets subject to fair value hierarchy: |  |
Fair value input | 8.00% | 7.00%
Level 3 |  |
Assets subject to fair value hierarchy: |  |
Fair value input | 8.00% | 9.00%

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