Variable Interest Entities - Narrative (Details)	3 Months Ended
Mar. 31, 2020
TIH
Variable Interest Entity [Line Items]
Capitalized cost, amortization period	5 years
TIH \| Minimum
Variable Interest Entity [Line Items]
Foregoing costs, percent	10.00%
TIH \| Maximum
Variable Interest Entity [Line Items]
Foregoing costs, percent	15.00%
CIH
Variable Interest Entity [Line Items]
Capitalized cost, amortization period	5 years

Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131251-203054

Name:	us-gaap_CapitalizedContractCostAmortizationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant