Non-controlling interests (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Noncontrolling Interest [Line Items]
Non-controlling interest	$ 55,488	$ 37,979
2degrees
Noncontrolling Interest [Line Items]
Non-controlling interest	39,223	20,426
Nueva Tel
Noncontrolling Interest [Line Items]
Non-controlling interest	45,122	51,165
Trilogy LLC
Noncontrolling Interest [Line Items]
Non-controlling interest	(28,159)	(32,874)
Salamanca Solutions International LLC
Noncontrolling Interest [Line Items]
Non-controlling interest	$ (698)	$ (738)

Amount of ownership interest in limited liability company (LLC) directly or indirectly attributable to noncontrolling interests.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

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