Revenue From Contract With Customer - Summary of contract costs (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($)
Balance	$ 3,050
Incremental costs of obtaining and contract fulfilment costs	19,519
Amortization included in operating costs	(6,930)
Foreign currency translation	159
Balance	$ 15,798

Contract Costs Foreign Currency Translation.

No definition available.

Name:	ck0001689382_ContractCostsForeignCurrencyTranslation
Namespace Prefix:	ck0001689382_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Contract costs incremental costs due to obtaining and contract fulfilment.

+ References

No definition available.

+ Details

Name:	ck0001689382_ContractCostsIncrementalCostsDueToObtainingAndContractFulfilment
Namespace Prefix:	ck0001689382_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

+ Details

Name:	us-gaap_CapitalizedContractCostAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

+ Details

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