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Goodwill and Other Intangible Assets - Estimated Amortization Expenses (Detail)
$ in Thousands
Jun. 30, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Remaining 2017 $ 23,689
2018 43,436
2019 39,943
2020 35,115
2021 $ 31,845