INVESTMENTS - Summary of Investments in Nonconsolidated Affiliates and Available-for-sale Securities (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Investments in and Advances to Affiliates, at Fair Value
Beginning balance				$ 88,838				$ 27,740	$ 88,838	$ 27,740
Cash advances									2,993	2,578
Acquisitions of investments, net									32,823	65,526
Equity in earnings (loss)	$ (15,807)	$ 1,117	$ (1,610)	(433)	$ 314	$ (857)	$ (690)	331	(16,733)	(902)	$ (9,416)
Disposals of investments, net									(3,476)
Foreign currency translation adjustment									(276)	(307)
Distributions received									(3,709)	(1,350)
Loss on investments									(14,798)	(5,000)
Other									2,196	553
Ending balance	87,858				88,838				87,858	88,838	27,740
Cost Method Investments
Investments in and Advances to Affiliates, at Fair Value
Beginning balance				58,802				16,269	58,802	16,269
Cash advances									0	0
Acquisitions of investments, net									26,086	47,546
Equity in earnings (loss)									0	0
Disposals of investments, net									(1,000)
Foreign currency translation adjustment									(196)	(13)
Distributions received									0	0
Loss on investments									(14,798)	(5,000)
Other									2,772	0
Ending balance	71,666				58,802				71,666	58,802	16,269
Marketable Equity Securities
Investments in and Advances to Affiliates, at Fair Value
Beginning balance				2,326				1,978	2,326	1,978
Cash advances									0	0
Acquisitions of investments, net									0	0
Equity in earnings (loss)									0	0
Disposals of investments, net									0
Foreign currency translation adjustment									(35)	(205)
Distributions received									0	0
Loss on investments									0	0
Other									(576)	553
Ending balance	1,715				2,326				1,715	2,326	1,978
Equity Method Investments
Investments in and Advances to Affiliates, at Fair Value
Beginning balance				$ 27,710				$ 9,493	27,710	9,493
Cash advances									2,993	2,578
Acquisitions of investments, net									6,737	17,980
Equity in earnings (loss)									(16,733)	(902)
Disposals of investments, net									(2,476)
Foreign currency translation adjustment									(45)	(89)
Distributions received									(3,709)	(1,350)
Loss on investments									0	0
Other										0
Ending balance	$ 14,477				$ 27,710				$ 14,477	$ 27,710	$ 9,493