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Schedule of Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total assets	$ 1,280,961	$ 1,212,127
Goodwill	262,649	262,813
Operating Segments [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Total assets	1,108,594	1,030,722
Goodwill	233,260	233,424
Operating Segments [Member] | Mode [Member]
Segment Reporting Information [Line Items]
Total assets	178,457	189,787
Goodwill	29,389	29,389
Intersegment Elims [Member]
Segment Reporting Information [Line Items]
Total assets	$ (6,090)	$ (8,382)

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



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-SubTopic 10



-Section S99



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-Subparagraph (SX 210.5-02.18)



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-Name Regulation S-X (SX)



-Number 210



-Section 03



-Paragraph 12



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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef



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-Name Accounting Standards Codification



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