Revenue Recognition - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
Jun. 30, 2018	Mar. 31, 2018
Contract Assets and Liabilities
Contract asset, current	$ 1,434	$ 1,309
Change in contract asset - current	$ 125
% of change in contract asset - current	10.00%
Contract asset, noncurrent	$ 568	498
Change in contract Asset – noncurrent	$ 70
% of change in contract Asset – noncurrent	14.00%
Contract liabilities	$ (9,552)	(9,827)
Change in contract liabilities	$ 275
% of change in contract liabilities	(3.00%)
Net contract liability	$ (7,550)	$ (8,020)
Change in net contract liability	$ 470
% of change in net contract liability	(6.00%)
Revenue recognized related to contract liability	$ 8,500
Amortization of contract assets	500
Revenue recognized in the period related to performance obligations that were satisfied or partially satisfied in previous periods	$ 600

Represents the amortization of contract assets into revenue.

No definition available.

Name:	atni_AmortizationOfContractAssetsIntoRevenue
Namespace Prefix:	atni_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of increase (decrease) in revenue recognized for current cumulative catch-up adjustment from the timing of customer prepayments and contract billings which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

No definition available.