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Goodwill and Other Intangible Assets - Estimated Future Amortization Expense (Detail)
$ in Thousands
Mar. 31, 2018
USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]  
2018 (April 1 through December 31) $ 2,094
2019 1,575
2020 1,552
Total amortization expense $ 5,221