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Goodwill and Intangible Assets - Summary of Amortization Expense to be Incurred in 2017 Through 2021 on Intangible Assets (Detail)
$ in Thousands
Jun. 30, 2017
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2017 $ 10,795
2018 8,063
2019 6,945
2020 6,942
2021 $ 6,942