Business Combination, Contingent Consideration Arrangements, Basis

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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-Publisher FASB

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For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

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-Publisher FASB

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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- Definition

Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount of liabilities assumed at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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-Publisher FASB

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Acquisitions (Details) (USD $)			0 Months Ended		0 Months Ended		0 Months Ended	9 Months Ended	0 Months Ended		0 Months Ended	9 Months Ended	0 Months Ended		0 Months Ended				0 Months Ended			3 Months Ended		9 Months Ended										3 Months Ended	9 Months Ended		9 Months Ended
Acquisitions (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012	Sep. 18, 2013 YES Trans [Member]	Sep. 30, 2013 YES Trans [Member]	Feb. 24, 2013 CTL [Member]	Sep. 30, 2013 CTL [Member]	Apr. 19, 2012 D&E [Member]	Sep. 30, 2013 D&E [Member]	Jun. 04, 2012 CTW [Member]	Sep. 30, 2013 CTW [Member]	Aug. 01, 2012 R & M [Member]	Sep. 30, 2013 R & M [Member]	Aug. 10, 2012 EFS [Member]	Sep. 30, 2013 EFS [Member]	Nov. 05, 2012 Central Cal [Member]	Sep. 30, 2013 Central Cal [Member]	Sep. 30, 2013 A&A [Member]	Sep. 30, 2013 DCT [Member]	Apr. 30, 2013 Wando [Member]	Apr. 30, 2013 Adrian [Member]	Sep. 30, 2013 Adrian [Member]	Sep. 30, 2013 Two Thousand Thirteen [Member]	Sep. 30, 2012 Two Thousand Thirteen [Member]	Sep. 30, 2013 Two Thousand Thirteen [Member]	Sep. 30, 2012 Two Thousand Thirteen [Member]	Sep. 30, 2013 Two Thousand Thirteen [Member] CTL [Member]	Sep. 30, 2013 Two Thousand Thirteen [Member] D&E [Member]	Sep. 30, 2013 Two Thousand Thirteen [Member] CTW [Member]	Sep. 30, 2013 Two Thousand Thirteen [Member] R & M [Member]	Sep. 30, 2013 Two Thousand Thirteen [Member] EFS [Member]	Sep. 30, 2013 Two Thousand Thirteen [Member] Central Cal [Member]	Sep. 30, 2013 Two Thousand Thirteen [Member] A&A [Member]	Sep. 30, 2013 Two Thousand Thirteen [Member] DCT [Member]	Sep. 30, 2012 Two Thousand Twelve [Member]	Sep. 30, 2012 Two Thousand Twelve [Member]	Sep. 30, 2013 Two Thousand Twelve [Member]	Sep. 30, 2013 Two Thousand Twelve [Member] CTL [Member]	Sep. 30, 2013 Two Thousand Twelve [Member] D&E [Member]	Sep. 30, 2013 Two Thousand Twelve [Member] CTW [Member]	Sep. 30, 2013 Two Thousand Twelve [Member] EFS [Member]
Business Acquisition [Line Items]
Consideration Transferred			$ 1,200,000		$ 6,200,000		$ 11,400,000		$ 7,600,000		$ 24,200,000		$ 10,000,000		$ 3,800,000				$ 9,000,000	$ 14,200,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	2,500,000			1,100,000		800,000				3,500,000		5,000,000		4,000,000		4,000,000	2,500,000	1,000,000			6,500,000										800,000
Business Combination, Contingent Consideration Arrangements, Basis								5,000,000				1,700,000														1,800,000	2,000,000	2,000,000	4,500,000	2,300,000	1,400,000	3,000,000	400,000				1,800,000	2,000,000	2,000,000	900,000
Schedule of allocated purchase price paid to fair value of acquired net assets for acquisitions
Accounts receivable																						22,702,000		22,702,000												15,175,000
Other current assets																						871,000		871,000												1,240,000
Property and equipment																						14,399,000		14,399,000												32,387,000
Goodwill	515,862,000	442,143,000																				77,041,000		77,041,000												75,135,000
Customer relationship intangible assets																						11,681,000		11,681,000												5,932,000
Other noncurrent assets																						12,000		12,000												(377,000)
Accounts payable and other liabilities																						(26,047,000)		(26,047,000)												(40,777,000)
Total																						100,659,000		100,659,000												88,715,000
Revenues																						377,327,000	328,754,000	1,099,439,000	921,033,000									297,048,000	884,413,000
Net income																						$ 13,199,000	$ 10,234,000	$ 37,923,000	$ 28,868,000									$ 9,971,000	$ 29,290,000