LONG-TERM OBLIGATIONS - NARRATIVE (Details) ₨ / shares in Units, $ in Thousands, ₨ in Millions				6 Months Ended
	Jul. 15, 2016 USD ($)	May 13, 2016 USD ($)	Jan. 12, 2016 USD ($)	Jun. 30, 2016 USD ($) installment shares	Jun. 30, 2015 USD ($)	Jun. 30, 2016 INR (₨) ₨ / shares shares	Dec. 31, 2015 USD ($)
Debt Instrument [Line Items]
Current portion of long-term obligations				$ 314,063			$ 50,202
Borrowings under credit facilities				1,326,866	$ 4,740,308
Credit Facility 2013 | Revolving Credit Facility
Debt Instrument [Line Items]
Borrowings under credit facilities				1,200,000
Repayment of indebtedness under credit facility				2,400,000
Credit Facility 2013 | Revolving Credit Facility | Subsequent Event
Debt Instrument [Line Items]
Borrowings under credit facilities	$ 110,000
Credit Facility 2014 | Revolving Credit Facility
Debt Instrument [Line Items]
Borrowings under credit facilities				80,000
Repayment of indebtedness under credit facility				220,000
Unsecured Debt | Viom Debt
Debt Instrument [Line Items]
Current portion of long-term obligations				70,300		₨ 4,750
Unsecured Debt | Credit Facility 2013
Debt Instrument [Line Items]
Principal amount				72,200
Unsecured Debt | Credit Facility 2014
Debt Instrument [Line Items]
Principal amount				$ 1,840,000
Secured Debt | Viom Term Loan | Minimum
Debt Instrument [Line Items]
Debt instrument, term (in years)				1 year
Prepayment penalty, as a percent of principal (as a percent)				1.00%
Repayment period (in months)				6 months
Long-term debt, stated interest rate (as a percent)				8.75%		8.75%
Secured Debt | Viom Term Loan | Maximum
Debt Instrument [Line Items]
Debt instrument, term (in years)				10 years
Prepayment penalty, as a percent of principal (as a percent)				2.00%
Repayment period (in months)				36 months
Long-term debt, stated interest rate (as a percent)				11.20%		11.20%
Secured Debt | Viom Term Loan | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.00%
Secured Debt | Viom Term Loan | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.55%
Secured Debt | Viom Term Loan | Marginal Cost of Funds based Lending Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.00%
Secured Debt | Viom Term Loan | Marginal Cost of Funds based Lending Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.55%
Secured Debt | Viom Debenture
Debt Instrument [Line Items]
Long-term debt, stated interest rate (as a percent)				9.90%		9.90%
Secured Debt | Viom Debenture | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				0.60%
Basis spread on variable rate, reset rate (as a percent)				10.00%
Basis spread on variable rate, first reset period (as a percent)				36 months
Basis spread on variable rate, second reset period (as a percent)				48 months
Secured Debt | Viom Debenture | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate, reset threshold (as a percent)				9.75%
Secured Debt | Viom Debenture | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate, reset threshold (as a percent)				10.25%
Secured Debt | Secured Cellular Site Revenue Notes, Series 2010-1 Class C
Debt Instrument [Line Items]
Current portion of long-term obligations				$ 67,400
Line of Credit | Viom Working Capital Facilities | Minimum
Debt Instrument [Line Items]
Long-term debt, stated interest rate (as a percent)				11.05%		11.05%
Line of Credit | Viom Working Capital Facilities | Maximum
Debt Instrument [Line Items]
Long-term debt, stated interest rate (as a percent)				11.60%		11.60%
Line of Credit | Viom Working Capital Facilities | Base Rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				1.60%
Line of Credit | Viom Working Capital Facilities | Base Rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)				2.30%
Preferred Stock | Viom preferred shares
Debt Instrument [Line Items]
Preferred stock, shares outstanding | shares				166,666,666		166,666,666
Number of redemption installments | installment				2
Preferred stock, redemption price (in INR per share) | ₨ / shares						₨ 10
Preferred stock, dividend rate percentage (in percent)				13.50%
Financial instrument, maximum settlement amount				$ 24,700		₨ 1,670
Financial instrument, maximum settlement amount classified as short term debt				$ 12,300		₨ 800
Redemption price (as a percent)				2.00%
Senior Notes
Debt Instrument [Line Items]
Maximum Adjusted EBITDA				3.5		3.5
Senior Notes | 3.30% and 4.40% Senior Notes
Debt Instrument [Line Items]
Proceeds from the issuance of debt			$ 1,237,200
Senior Notes | 3.30% Senior Notes
Debt Instrument [Line Items]
Long-term debt, stated interest rate (as a percent)			3.30%	3.30%		3.30%	3.30%
Principal amount			$ 750,000
Senior Notes | 4.40% Senior Notes
Debt Instrument [Line Items]
Long-term debt, stated interest rate (as a percent)			4.40%	4.40%		4.40%	4.40%
Principal amount			$ 500,000
Senior Notes | 3.375% Senior Notes
Debt Instrument [Line Items]
Long-term debt, stated interest rate (as a percent)		3.375%		3.375%		3.375%	3.375%
Principal amount		$ 1,000,000
Proceeds from the issuance of debt		$ 981,500
Senior Notes | Senior Notes
Debt Instrument [Line Items]
Redemption price (as a percent)				100.00%
Conditional repurchase price as percent of principal				101.00%		101.00%
Viom Transaction
Debt Instrument [Line Items]
Current portion of long-term obligations				$ 194,700		₨ 13,100