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Schedule of Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |
Total assets | $ 1,360,259 | $ 1,301,146 |
Goodwill | 262,376 | 262,594 | $ 262,813
Hub [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Goodwill | 232,987 | 233,205 | $ 233,424
Operating Segments [Member] | Hub [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 1,178,110 | 1,127,042 |
Goodwill | 232,987 | 233,205 |
Operating Segments [Member] | Mode LLC [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | 191,374 | 181,514 |
Goodwill | 29,389 | 29,389 |
Intersegment Elims [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Total assets | $ (9,225) | $ (7,410) |

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