Acquisitions - Recognized Identified Assets Acquired and Liabilities Assumed (Detail) € in Millions, $ in Millions	Sep. 09, 2015 USD ($)	Jun. 08, 2015 USD ($)	Jun. 08, 2015 EUR (€)	Sep. 02, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Business Acquisition [Line Items]
Goodwill						$ 4,610.6	$ 929.3	$ 363.4
Con-Way, Inc.
Business Acquisition [Line Items]
Consideration	$ 2,317.8
Accounts receivable	669.9
Other current assets	99.9
Property and equipment	1,931.0
Deferred tax assets, long-term	34.6
Other long-term assets	48.5
Accounts payable	(353.5)
Accrued expenses	(380.6)
Other current liabilities	(27.5)
Long-term debt	(640.6)
Deferred tax liabilities, long-term	(689.4)
Employee benefit obligations	(159.8)
Other long-term liabilities	(196.7)
Goodwill	1,188.8
Con-Way, Inc. | Trade names
Business Acquisition [Line Items]
Intangible assets acquired	5.6
Con-Way, Inc. | Non-compete agreements
Business Acquisition [Line Items]
Intangible assets acquired	2.4
Con-Way, Inc. | Customer relationships
Business Acquisition [Line Items]
Intangible assets acquired	$ 785.2
Norbert Dentressangle SA
Business Acquisition [Line Items]
Consideration		$ 2,955.3	€ 2,645.2
Accounts receivable		1,060.4
Other current assets		350.2
Property and equipment		730.7
Deferred tax assets, long-term		147.5
Other long-term assets		68.3
Accounts payable		(804.1)
Accrued expenses		(422.0)
Other current liabilities		(164.6)
Long-term debt		(643.4)
Deferred tax liabilities, long-term		(366.8)
Employee benefit obligations		(142.3)
Other long-term liabilities		(155.2)
Noncontrolling interests		(37.2)
Goodwill		2,461.2
Norbert Dentressangle SA | Trade name covenants
Business Acquisition [Line Items]
Intangible assets acquired		40.0
Norbert Dentressangle SA | Non-compete agreements
Business Acquisition [Line Items]
Intangible assets acquired		5.6
Norbert Dentressangle SA | Contractual customer relationships
Business Acquisition [Line Items]
Intangible assets acquired		$ 827.0
New Breed Logistics
Business Acquisition [Line Items]
Consideration				$ 615.9
Cash and cash equivalents				1.8
Accounts receivable				112.1
Other current assets				29.6
Property and equipment				112.7
Other long-term assets				15.8
Accounts payable				(17.7)
Accrued expenses				(33.4)
Deferred tax liabilities, long-term				(75.0)
Other long-term liabilities				(9.3)
Goodwill				350.1
New Breed Logistics | Trade names
Business Acquisition [Line Items]
Intangible assets acquired				4.5
New Breed Logistics | Contractual customer relationships
Business Acquisition [Line Items]
Intangible assets acquired				115.1
Contractual customer relationships liability				(5.6)
New Breed Logistics | Non-contractual customer relationships
Business Acquisition [Line Items]
Intangible assets acquired				$ 15.2
Pacer International
Business Acquisition [Line Items]
Consideration					$ 331.5
Cash and cash equivalents					22.3
Accounts receivable					119.6
Other current assets					9.4
Property and equipment					43.5
Deferred tax assets, long-term					2.8
Other long-term assets					2.4
Accounts payable					(71.6)
Accrued expenses					(53.7)
Other current liabilities					(2.0)
Other long-term liabilities					(11.6)
Goodwill					198.0
Pacer International | Trade names
Business Acquisition [Line Items]
Intangible assets acquired					2.8
Pacer International | Non-compete agreements
Business Acquisition [Line Items]
Intangible assets acquired					2.3
Pacer International | Contractual customer relationships
Business Acquisition [Line Items]
Intangible assets acquired					66.3
Pacer International | Non-contractual customer relationships
Business Acquisition [Line Items]
Intangible assets acquired					$ 1.0