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Components of Other Intangible Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Other Intangible Assets [Line Items] |  |
Intangible Assets, Gross Amount | $ 20,543 | $ 20,543
Finite-lived intangible assets, Accumulated Amortization | (8,699) | (7,404)
Intangible Assets, Net Carrying Value | 11,844 | 13,139
Hub [Member] | Customer Relationships [Member] |  |
Other Intangible Assets [Line Items] |  |
Finite-lived intangible assets, Gross Amount | 5,181 | 5,181
Finite-lived intangible assets, Accumulated Amortization | (3,792) | (3,350)
Finite-lived intangible assets, Net Carrying Value | $ 1,389 | $ 1,831
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
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 | (4,907) | (4,054)
Finite-lived intangible assets, Net Carrying Value | $ 10,455 | $ 11,308
Intangible assets estimated useful life | 18 years | 18 years

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