Equipment on Operating Leases - Additional Information (Detail) $ in Millions	Dec. 31, 2016 USD ($)
Financial Services
Property Subject to or Available for Operating Lease [Line Items]
Minimum lease payments receivable for operating leases, in 2017	$ 587.0
Minimum lease payments receivable for operating leases, in 2018	428.6
Minimum lease payments receivable for operating leases, in 2019	253.6
Minimum lease payments receivable for operating leases, in 2020	125.2
Minimum lease payments receivable for operating leases, in 2021	50.0
Minimum lease payments receivable for operating leases, thereafter	6.1
Truck, Parts and Other
Property Subject to or Available for Operating Lease [Line Items]
Annual amortization of deferred lease revenues, in 2017	153.2
Annual amortization of deferred lease revenues, in 2018	111.8
Annual amortization of deferred lease revenues, in 2019	65.1
Annual amortization of deferred lease revenues, in 2020	39.6
Annual amortization of deferred lease revenues, in 2021	3.2
Annual amortization of deferred lease revenues, thereafter	0.5
Annual maturities of the residual value guarantees, in 2017	259.7
Annual maturities of the residual value guarantees, in 2018	168.1
Annual maturities of the residual value guarantees, in 2019	175.8
Annual maturities of the residual value guarantees, in 2020	51.7
Annual maturities of the residual value guarantees, in 2021	36.5
Annual maturities of the residual value guarantees, thereafter	$ 7.4