REVENUE FROM CONTACTS WITH CUSTOMERS - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 162,724	$ 147,477
10-year agreement
Revenue from External Customer [Line Items]
Contract liability	2,000		$ 2,100
Decrease in Contract with Customer, Liability	100
Insurance commissions [Member]
Revenue from External Customer [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,700	$ 2,100