Basis of Presentation - Additional Information (Details)	9 Months Ended
	Sep. 30, 2019 Entity
Variable Interest Entity [Line Items]
Number Of Variable Interest Entities	10
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Number Of Variable Interest Entities Not A Primary Beneficiary	5
Variable Interest Entity, Not Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Number Of Variable Interest Entities Primary Beneficiary	5