Commitments and Contingencies - Additional Information (Detail) $ in Millions	Mar. 31, 2016 USD ($) LegalMatter	Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items]
Loss Contingency, Pending Claims, Number | LegalMatter	4,000
Liability For Claims And Contingencies	$ 235.4	$ 237.9
Liability Reserve For Insurance Claims	110.3	111.0
Environmental Reserve Other Accrued Costs	19.7	22.8
Letters of credit outstanding	$ 382.8	$ 402.2