Related Party Transactions - Schedule of Transactions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Percentage of Organizational and Offering Costs Limit	15.00%
Due to Related Parties [Roll Forward]
Incurred	$ 5,805	$ 5,966
Due to affiliates	12,168		$ 19,048
Corporate operating expenses
Due to Related Parties [Roll Forward]
Incurred	829	678
Due to affiliates	892		63
Other operating expenses
Due to Related Parties [Roll Forward]
Incurred	0	0
Due to affiliates	215		215
Property management fees
Due to Related Parties [Roll Forward]
Incurred	481	459
Due to affiliates	165		157
Performance distribution allocation
Due to Related Parties [Roll Forward]
Incurred	1,920	2,061
Due to affiliates	1,920		7,807
Advisory fees
Due to Related Parties [Roll Forward]
Incurred	2,339	2,301
Due to affiliates	0		781
Capitalized/Offering - Organization and offering expense
Due to Related Parties [Roll Forward]
Incurred	3	240
Due to affiliates	1,316		1,312
Capitalized/Offering - Other costs advanced by the Advisor
Due to Related Parties [Roll Forward]
Incurred	228	71
Due to affiliates	374		367
Capitalized/Offering - Selling commissions
Due to Related Parties [Roll Forward]
Incurred	0	11
Due to affiliates	0		0
Capitalized/Offering - Dealer Manager fees
Due to Related Parties [Roll Forward]
Incurred	0	45
Due to affiliates	0		0
Capitalized/Offering - Stockholder servicing fee
Due to Related Parties [Roll Forward]
Incurred	0	82
Due to affiliates	7,252		8,302
Capitalized/Offering - Distribution fees
Due to Related Parties [Roll Forward]
Incurred	5	0
Due to affiliates	0		0
Organization and offering expenses
Due to Related Parties [Roll Forward]
Incurred	0	18
Due to affiliates	34		44
Advisor advances - Dealer Manager fees
Due to Related Parties [Roll Forward]
Incurred	0	$ 0
Due to affiliates	$ 0		$ 0
Class AA | Dealer Manager Agreement
Related Party Transaction [Line Items]
Related Party Stockholder Servicing Fee for Issuance of Shares, Percent	4.00%