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Amortization Expense (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Finite Lived Intangible Assets [Line Items]  
2017 $ 1,295
2018 1,248
2019 1,108
2020 1,108
2021 895
Hub [Member]  
Finite Lived Intangible Assets [Line Items]  
2017 442
2018 395
2019 255
2020 255
2021 42
Mode [Member]  
Finite Lived Intangible Assets [Line Items]  
2017 853
2018 853
2019 853
2020 853
2021 $ 853