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REVENUE FROM CONTACTS WITH CUSTOMERS - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Revenue from External Customer [Line Items]          
Revenue $ 164,769 $ 150,943 $ 327,493 $ 298,420  
10-year agreement          
Revenue from External Customer [Line Items]          
Contract liability 1,900   1,900   $ 2,100
Decrease in Contract with Customer, Liability (100)   (200)    
Insurance commissions [Member]          
Revenue from External Customer [Line Items]          
Revenue $ 4 $ 300 $ 2,700 $ 2,400