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Schedule of future amortization expense (Detail)
Mar. 31, 2019
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2019 $ 10,661,000
2020 12,671,000
2021 10,960,000
2022 9,448,000
2023 7,790,000
Thereafter 29,532,000
Total $ 81,062,000