(Narrative) (Details)		3 Months Ended
		Mar. 31, 2016 USD ($) Segment Units	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Finite-Lived Intangible Assets [Line Items]
Number of operating segments | Segment		3
Number of reporting units | Units		4
Impairment of goodwill		$ 0
Goodwill	[1]	683,379,000		$ 682,810,000
Finite-lived intangible assets		73,547,000		75,694,000
Amortization of Intangible Assets		$ 2,100,000	$ 2,000,000
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
Goodwill		$ 255,509,000		254,940,000
Finite-lived intangible assets		$ 46,546,000		47,754,000
LTL
Finite-Lived Intangible Assets [Line Items]
Number of reporting units | Units		1
Goodwill		$ 197,312,000		197,312,000
Finite-lived intangible assets		$ 325,000		341,000
Global Solutions
Finite-Lived Intangible Assets [Line Items]
Number of reporting units | Units		2
Goodwill		$ 230,558,000		230,558,000
Finite-lived intangible assets		26,676,000		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