REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Contract Assets
Beginning balance, net of allowance	$ 1,200,050	$ 1,071,418
Additions (collections), net	(151,417)	(110,376)
Bad debt, net of recoveries	(7,460)	(5,538)
Ending balance, net of allowance	1,041,173	955,504
Accounts receivable from leases	325,839	289,145
Accounts receivable, total	1,367,012	1,244,649	$ 1,508,370
Contract Liabilities
Beginning balance	297,686	313,545
Revenue recognized, included in beginning balance	(112,114)	(124,246)
Additions, net of revenue recognized during period	138,613	136,651
Ending balance	324,185	325,950
Deferred income from leases	68,571	66,758
Deferred income, total	$ 392,756	$ 392,708

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant