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Schedule of Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Total assets | $ 1,670,941 | $ 1,360,259 |
Goodwill | 348,661 | 262,376 | $ 262,594
Hub [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 319,272 | 232,987 | $ 233,205
Operating Segments [Member] | Hub [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 1,470,792 | 1,178,110 |
Goodwill | 319,272 | 232,987 |
Operating Segments [Member] | Mode LLC [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 210,088 | 191,374 |
Goodwill | 29,389 | 29,389 |
Intersegment Elims [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | $ (9,939) | $ (9,225) |

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