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Commitments and Contingencies - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) employee | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |
Reserves for pending legal disputes, including commercial disputes and other matters | $ 25.8 | $ 11.0 |
Environmental reserves | $ 9.0 | 9.0 |
Percentage employees that are members of collective bargaining agreements | 46.00% |  |
Rent expense | $ 144.7 | $ 126.4 | $ 126.2
Unionized workforce subject to labor agreement expiring in 2014 |  |  |
Loss Contingencies [Line Items] |  |  |
Percentage employees that are members of collective bargaining agreements | 77.00% |  |
Number of employees | employee | 76,400 |  |
Unionized workforce subject to labor agreement expiring in 2014 | United States and Canada |  |  |
Loss Contingencies [Line Items] |  |  |
Percentage employees that are members of collective bargaining agreements | 2.00% |  |

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