ACCUMULATED OTHER COMPREHENSIVE INCOME (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	$ 2,346,545
Gross amounts reclassified within AOCI	0	$ 0
Balance, end of period	2,359,210
Total Post- Retirement Benefits Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	2,082	2,061
Gross amounts reclassified within AOCI	0	0
Balance, end of period	2,082	2,061
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(45,205)	(79,927)
Gross amounts reclassified within AOCI	25,155	27,968
Balance, end of period	(20,050)	(51,959)
Non-controlling Interest - Former Principal Equityholders Reclassification
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	25,155	59,877
Gross amounts reclassified within AOCI	(25,155)	(27,968)
Balance, end of period	0	31,909
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(17,968)	(17,989)
Balance, end of period	$ (17,968)	$ (17,989)