CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Cash Flows [Abstract]
Net loss	$ (41,960,000)	$ (37,712,000)	$ (221,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	120,924,000	28,889,000	1,077,000
Amortization of deferred financing costs	3,737,000	1,313,000	0
Amortization of mortgage premiums	(1,933,000)	(689,000)	0
Amortization of market lease and other intangibles, net	(101,000)	638,000	13,000
Bad debt expense	7,291,000	0	0
Equity-based compensation	60,000	73,000	16,000
Gain on sale of investment securities	(446,000)	(8,000)	0
Changes in assets and liabilities:
Straight-line rent receivable	(12,535,000)	(2,208,000)	(117,000)
Prepaid expenses and other assets	(12,893,000)	(8,837,000)	(1,905,000)
Accounts payable, accrued expenses and other liabilities	5,203,000	10,877,000	327,000
Deferred rent	1,333,000	2,977,000	46,000
Restricted cash	(2,869,000)	(1,778,000)	0
Net cash provided by (used in) operating activities	65,811,000	(6,465,000)	(764,000)
Cash flows from investing activities:
Investment in real estate and other assets	(570,134,000)	(1,506,862,000)	(46,134,000)
Deposits for real estate acquisitions	1,000,000	(3,650,000)	(350,000)
Capital expenditures	(6,885,000)	(807,000)	0
Purchase of investment securities	(93,000)	(20,328,000)	0
Proceeds from sale of investment securities	19,278,000	513,000	0
Net cash used in investing activities	(556,834,000)	(1,531,134,000)	(46,484,000)
Cash flows from financing activities:
Proceeds from credit facility	440,000,000	0	0
Payments of credit facility	(10,000,000)	0	0
Payments of mortgage notes payable	(6,389,000)	(535,000)	0
Payments of deferred financing costs	(13,283,000)	(5,408,000)	(7,000)
Proceeds from issuance of common stock	6,000	1,853,231,000	184,006,000
Common stock repurchases	(10,413,000)	(541,000)	0
Payments of offering costs and fees related to common stock issuances	(629,000)	(202,715,000)	(23,696,000)
Distributions paid	(66,214,000)	(35,165,000)	(1,305,000)
Contributions from non-controlling interest holders	500,000	0	0
Distributions to non-controlling interest holders	(698,000)	0	0
Payments to related parties	0	(484,000)	80,000
Net cash provided by financing activities	332,880,000	1,608,383,000	159,078,000
Net change in cash and cash equivalents	(158,143,000)	70,784,000	111,830,000
Cash and cash equivalents, beginning of period	182,617,000	111,833,000	3,000
Cash and cash equivalents, end of period	24,474,000	182,617,000	111,833,000
Supplemental disclosures of cash flow information:
Cash paid for interest	7,867,000	2,313,000	0
Cash paid for taxes	374,000	601,000	0
Non-cash investing and financing activities:
Payable and accrued offering costs	0	631,000	489,000
Accrued repurchases included in accounts payable and accrued expenses	12,014,000	1,267,000	40,000
Assumption of mortgage notes payable used to acquire investments in real estate	100,058,000	66,321,000	0
Premiums on assumed mortgage notes payable	1,492,000	3,533,000	1,345,000
Liabilities assumed in real estate acquisitions	882,000	9,040,000	91,000
Common stock issued through distribution reinvestment plan	78,502,000	41,580,000	1,345,000
Reclassification of deferred offering costs to equity	$ 0	$ 0	$ 807,000