BORROWING ARRANGEMENTS (Narrative 2) (Detail) - USD ($) $ in Thousands	1 Months Ended
	May 25, 2017	Dec. 16, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 16, 2015
Borrowing Arrangements [Line Items]
Total term loans - net			$ 898,726	$ 904,670
Amended 2015 Term Loan Facility
Borrowing Arrangements [Line Items]
Total term loans - net	$ 250,000
Description of variable rate basis	LIBOR
Maturity date	Dec. 16, 2022
Amended 2015 Term Loan Facility | Minimum
Borrowing Arrangements [Line Items]
Pricing of credit facility at LIBOR plus an applicable percentage	1.40%
Amended 2015 Term Loan Facility | Maximum
Borrowing Arrangements [Line Items]
Pricing of credit facility at LIBOR plus an applicable percentage	2.35%
Unsecured Debt [Member]
Borrowing Arrangements [Line Items]
Total term loans - net			898,726	904,670
Unsecured Debt [Member] | Amended 2015 Term Loan Facility
Borrowing Arrangements [Line Items]
Total term loans - net			$ 250,000	$ 250,000	$ 250,000
Unsecured Debt [Member] | Amended 2015 Term Loan Facility | Interest Rate Swap [Member]
Borrowing Arrangements [Line Items]
Rate		3.8005%
Description of variable rate basis		one-month LIBOR
Maturity date		Dec. 15, 2022
Unsecured Debt [Member] | Amended 2015 Term Loan Facility | Minimum | Interest Rate Swap [Member]
Borrowing Arrangements [Line Items]
Pricing of credit facility at LIBOR plus an applicable percentage		0.40%
Unsecured Debt [Member] | Amended 2015 Term Loan Facility | Maximum | Interest Rate Swap [Member]
Borrowing Arrangements [Line Items]
Pricing of credit facility at LIBOR plus an applicable percentage		0.55%