COMMITMENTS AND CONTINGENCIES - NARRATIVE (Details) ₨ in Millions, $ in Millions				3 Months Ended
	Dec. 05, 2016 INR (₨)	Dec. 05, 2016 USD ($)	Mar. 27, 2015 USD ($) communications_site renewal_period	Mar. 31, 2020 USD ($) communications_site communication_site renewal_period
INDIA
Loss Contingencies [Line Items]
Foreign income tax assessment	₨ 4,750	$ 69.8
Verizon Transaction
Loss Contingencies [Line Items]
Capital leased assets, number of units (in number of communication sites) | communications_site			11,250
Right to lease, weighted average term			28 years
Aggregate purchase option price for towers | $			$ 5,000.0
Customer lease, initial term			10 years
Successive terms to renew lease (in numbers of terms) | renewal_period			8
Renewal term			5 years
AT&T Transaction
Loss Contingencies [Line Items]
Capital leased assets, number of units (in number of communication sites) | communications_site				2,200
Aggregate purchase option price for towers | $				$ 960.4
Successive terms to renew lease (in numbers of terms) | renewal_period				5
Renewal term				5 years
Operating lease, term of contract				27 years
Number of sites acquired life to date | communication_site				228