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Intangible Assets - Summary of Amortization Expenses (Detail)
$ in Thousands
Sep. 30, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
2017 (period from October 1 to December 31) $ 7,137
2018 24,284
2019 14,427
2020 8,382
2021 2,425
Thereafter $ 1,723