OTHER INFORMATION - Components of Accumulated Other Comprehensive Loss, Net of Tax (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	$ (11,327,455)	$ (10,885,475)	$ (10,606,681)	$ (9,665,208)
Cumulative currency translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	(282,588)	(319,696)
Cumulative unrealized gain on securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	1,058	1,428
Cumulative other adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	(31,030)	(37,608)
Total accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive loss	$ (312,560)	$ (355,876)	$ (414,407)	$ (308,590)