Related Party Arrangements - Narrative - Property Management Fees and Expenses (Details) - Steadfast Management Company, Inc. [Member] - Property Management Agreement [Member]	12 Months Ended
	Dec. 31, 2018
Related Party Transaction [Line Items]
Property management agreement, notice of termination breach	30 days
Property Manager [Member]
Related Party Transaction [Line Items]
Property management, oversight fee, percent	1.00%
Property management agreement, initial term	1 year
Property management agreement, notice of termination option	60 days
Property Manager [Member] | Minimum [Member]
Related Party Transaction [Line Items]
Property management fee, percent	2.50%
Property Manager [Member] | Maximum [Member]
Related Party Transaction [Line Items]
Property management fee, percent	3.50%