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ACCOUNTS RECEIVABLE, NET OF ALLOWANCE - Long Term Accounts Receivable, Net of Allowance (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Receivables [Abstract]    
Customer receivables $ 154,903 $ 147,557
Unearned finance income (16,022) (15,327)
Allowance for doubtful accounts (5,711) (5,408)
Accounts receivable, net of allowance 133,170 126,822
Less: Current portion, net of allowance 57,869 54,014
Long-term portion, net of allowance $ 75,301 $ 72,808