Equipment on Operating Leases - Additional Information (Detail) $ in Millions	Dec. 31, 2015 USD ($)
Financial Services
Property Subject to or Available for Operating Lease [Line Items]
Minimum lease payments receivable for operating leases, in 2016	$ 542.1
Minimum lease payments receivable for operating leases, in 2017	415.4
Minimum lease payments receivable for operating leases, in 2018	250.4
Minimum lease payments receivable for operating leases, in 2019	108.0
Minimum lease payments receivable for operating leases, in 2020	32.4
Minimum lease payments receivable for operating leases, thereafter	6.0
Truck, Parts and Other
Property Subject to or Available for Operating Lease [Line Items]
Annual amortization of deferred lease revenues, in 2016	134.9
Annual amortization of deferred lease revenues, in 2017	100.5
Annual amortization of deferred lease revenues, in 2018	64.3
Annual amortization of deferred lease revenues, in 2019	41.3
Annual amortization of deferred lease revenues, in 2020	14.7
Annual amortization of deferred lease revenues, thereafter	0.3
Annual maturities of the residual value guarantees, in 2016	284.0
Annual maturities of the residual value guarantees, in 2017	228.0
Annual maturities of the residual value guarantees, in 2018	97.6
Annual maturities of the residual value guarantees, in 2019	49.7
Annual maturities of the residual value guarantees, in 2020	26.1
Annual maturities of the residual value guarantees, thereafter	$ 6.0