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Schedule of Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total assets	$ 1,733,504	$ 1,670,941
Goodwill, net	348,106	348,661
Operating Segments [Member] | Hub [Member]
Segment Reporting Information [Line Items]
Total assets	1,513,130	1,470,792
Goodwill, net	318,717	319,272
Operating Segments [Member] | Mode LLC [Member]
Segment Reporting Information [Line Items]
Total assets	227,425	210,088
Goodwill, net	29,389	29,389
Intersegment Elims [Member]
Segment Reporting Information [Line Items]
Total assets	$ (7,051)	$ (9,939)

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