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Components of Other Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Other Intangible Assets [Line Items]    
Intangible Assets, Gross Amount $ 20,543 $ 23,447
Finite-lived intangible assets, Accumulated Amortization (7,404) (6,109)
Indefinite-lived intangible assets, Accumulated Impairment Loss   (2,904)
Intangible Assets, Net Carrying Value 13,139 14,434
Hub [Member]    
Other Intangible Assets [Line Items]    
Intangible Assets, Gross Amount 5,181 8,085
Finite-lived intangible assets, Accumulated Amortization (3,350) (2,909)
Indefinite-lived intangible assets, Accumulated Impairment Loss   (2,904)
Intangible Assets, Net Carrying Value 1,831 2,272
Hub [Member] | Trade Names [Member]    
Other Intangible Assets [Line Items]    
Indefinite-lived intangible assets, Accumulated Impairment Loss   (2,904)
Indefinite-lived intangible assets, Gross Amount   2,904
Indefinite-lived intangible assets, Net Carrying Value   0
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 (3,350) (2,909)
Finite-lived intangible assets, Net Carrying Value $ 1,831 $ 2,272
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 (4,054) (3,200)
Finite-lived intangible assets, Net Carrying Value $ 11,308 $ 12,162
Intangible assets estimated useful life 18 years 18 years