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Prepaid Expenses - Prepaid Expenses, Net (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Prepaid Expense Current [Abstract]    
Prepaid maintenance $ 6,012 $ 6,218
Prepaid insurance 5,623 5,321
Prepaid software 4,520 4,236
Prepaid other 5,193 5,093
Total prepaid expenses $ 21,348 $ 20,868