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Schedule of future amortization expense (Detail)
Dec. 31, 2017
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2018 $ 16,657,000
2019 14,480,000
2020 12,671,000
2021 10,961,000
2022 9,448,000
Thereafter 37,323,000
Total $ 101,540,000