Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Committed Expenditures (Detail)

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Commitments and Contingencies - Committed Expenditures (Detail) - Vehicle Fleet Committed Capital
$ in Millions
Jun. 30, 2018
USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]  
Estimated committed capital in current year $ 48.2
Estimated committed capital next year $ 1.1