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Commitments and Contingencies - Collective Bargaining Agreements (Detail) - Withdrawal from Multiemployer Defined Benefit Plan - Central States Plan - USD ($) $ in Millions | 1 Months Ended | 55 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Jan. 31, 2016 | Jul. 31, 2014 | Oct. 09, 2013
Loss Contingencies [Line Items] |  |  |  |  |
Final settlement amount | $ 48.9 | $ 48.9 |  |  |
Amount of withdrawal liability | 44.1 | 44.1 | $ 32.9 | $ 39.6 |
Interest on assessed amount of withdrawal liability | 4.8 | 4.8 |  |  |
Payment of withdrawal liability assessment amount | $ 25.5 |  |  |  |
Acquired Company |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Amount of withdrawal liability |  |  | $ 4.8 |  | $ 4.8
Payment of withdrawal liability assessment amount |  | $ 4.2 |  |  |
Amount of withdrawal liability, amount suggested by Plan which is different than amount recorded by company |  |  |  |  | $ 6.9

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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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