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Schedule of future amortization expense (Detail)
Dec. 31, 2018
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2019 $ 14,480,000
2020 12,671,000
2021 10,960,000
2022 9,448,000
2023 7,793,000
Thereafter 29,530,000
Total $ 84,882,000