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Components of Other Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Other Intangible Assets [Line Items] |  |
Finite-lived intangible assets, Accumulated Amortization | $ (12,595) | $ (8,699)
Intangible Assets, Gross Amount | 86,943 | 20,543
Intangible Assets, Net Carrying Value | 74,348 | 11,844
Hub [Member] | Customer Relationships [Member] |  |
Other Intangible Assets [Line Items] |  |
Finite-lived intangible assets, Gross Amount | 71,181 | 5,181
Finite-lived intangible assets, Accumulated Amortization | (6,434) | (3,792)
Finite-lived intangible assets, Net Carrying Value | $ 64,747 | $ 1,389
Hub [Member] | Customer Relationships [Member] | Minimum [Member] |  |
Other Intangible Assets [Line Items] |  |
Intangible assets estimated useful life | 7 years | 7 years
Hub [Member] | Customer Relationships [Member] | Maximum [Member] |  |
Other Intangible Assets [Line Items] |  |
Intangible assets estimated useful life | 15 years | 15 years
Hub [Member] | Trade Name [Member] |  |
Other Intangible Assets [Line Items] |  |
Finite-lived intangible assets, Gross Amount | $ 400 |
Finite-lived intangible assets, Accumulated Amortization | $ (400) |
Intangible assets estimated useful life | 3 months |
Mode [Member] | Agency/Customer Relationships [Member] |  |
Other Intangible Assets [Line Items] |  |
Finite-lived intangible assets, Gross Amount | $ 15,362 | $ 15,362
Finite-lived intangible assets, Accumulated Amortization | (5,761) | (4,907)
Finite-lived intangible assets, Net Carrying Value | $ 9,601 | $ 10,455
Intangible assets estimated useful life | 18 years | 18 years

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