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ACCOUNTS RECEIVABLE, NET OF ALLOWANCE - Long Term Accounts Receivable, Net of Allowance (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Receivables [Abstract]    
Customer receivables $ 156,503 $ 154,903
Unearned finance income (15,633) (16,022)
Allowance for doubtful accounts (5,973) (5,711)
Accounts receivable, net of allowance 134,897 133,170
Less: Current portion, net of allowance 58,912 57,869
Long-term portion, net of allowance $ 75,985 $ 75,301