(Narrative) (Details)		3 Months Ended		6 Months Ended
		Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) Segment Units	Jun. 30, 2015 USD ($)	Mar. 31, 2016	Dec. 31, 2015 USD ($)	Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Number of reporting units | Units				4
Number of operating segments | Segment				3
Impairment of goodwill				$ 0
Goodwill	[1]	$ 682,013,000		682,013,000			$ 682,810,000
Finite-lived intangible assets		71,407,000		71,407,000			75,694,000
Amortization of Intangible Assets		2,200,000	$ 2,100,000	$ 4,300,000	$ 4,100,000
Customer Relationships | Minimum
Finite-Lived Intangible Assets [Line Items]
Period of amortization of intangible assets				5 years
Customer Relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Period of amortization of intangible assets				12 years
TL
Finite-Lived Intangible Assets [Line Items]
Number of reporting units | Units				1
Percentage of fair value in excess of carrying value						87.00%
Goodwill		254,143,000		$ 254,143,000			254,940,000
Finite-lived intangible assets		45,346,000		$ 45,346,000			47,754,000
LTL
Finite-Lived Intangible Assets [Line Items]
Number of reporting units | Units				1
Percentage of fair value in excess of carrying value								44.00%
Goodwill		197,312,000		$ 197,312,000			197,312,000
Finite-lived intangible assets		308,000		$ 308,000			341,000
Global Solutions
Finite-Lived Intangible Assets [Line Items]
Number of reporting units | Units				2
Goodwill		230,558,000		$ 230,558,000			230,558,000
Finite-lived intangible assets		$ 25,753,000		$ 25,753,000			27,599,000
Adjustments | TL And Global Solutions
Finite-Lived Intangible Assets [Line Items]
Goodwill							77,500,000
Finite-lived intangible assets							$ 2,700,000

[1] See Note 13 “Restatement of Previously Issued Financial Statements