Equipment on Operating Leases - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Financial Services
Property Subject to or Available for Operating Lease [Line Items]
Minimum lease payments for operating leases, in 2014	$ 530.3
Minimum lease payments for operating leases, in 2015	373.4
Minimum lease payments for operating leases, in 2016	245.0
Minimum lease payments for operating leases, in 2017	127.2
Minimum lease payments for operating leases, in 2018	41.9
Minimum lease payments for operating leases, thereafter	6.6
Truck, Parts and Other
Property Subject to or Available for Operating Lease [Line Items]
Annual amortization of deferred lease revenues, in 2014	175.3
Annual amortization of deferred lease revenues, in 2015	127.5
Annual amortization of deferred lease revenues, in 2016	82.7
Annual amortization of deferred lease revenues, in 2017	47.8
Annual amortization of deferred lease revenues, in 2018	6.5
Annual amortization of deferred lease revenues, thereafter	0.1
Annual maturities of the residual value guarantees, in 2014	180.0
Annual maturities of the residual value guarantees, in 2015	149.2
Annual maturities of the residual value guarantees, in 2016	144.0
Annual maturities of the residual value guarantees, in 2017	120.4
Annual maturities of the residual value guarantees, in 2018	45.6
Annual maturities of the residual value guarantees, thereafter	$ 14.7