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Schedule of Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total assets	$ 1,599,863	$ 1,360,259
Goodwill	348,506	262,376
Operating Segments [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Total assets	1,421,628	1,178,110
Goodwill	319,117	232,987
Operating Segments [Member] | Mode LLC [Member]
Segment Reporting Information [Line Items]
Total assets	184,996	191,374
Goodwill	29,389	29,389
Intersegment Elims [Member]
Segment Reporting Information [Line Items]
Total assets	$ (6,761)	$ (9,225)

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- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
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-Section S99
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 350
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-Section 50
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-Name Accounting Standards Codification
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