Summarized Condensed Consolidating Information - Condensed Consolidating Statements of Cash Flows (Detail) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
	Mar. 28, 2016	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net cash (used in) provided by operating activities			$ 49,513	$ 29,035
Cash flows from investing activities:
Acquisitions of real estate			(185,284)	(231,501)
Improvements to real estate			(258)	(143)
Purchases of equipment, furniture and fixtures			(139)	(256)
Preferred equity investments			(4,531)	0
Escrow deposit for acquisition of real estate			(1,000)	0
Net proceeds from sale of vacant land			0	30
Distribution from subsidiary			0	0
Intercompany financing			0	0
Net cash used in investing activities			(191,212)	(231,870)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net	$ 105,800	$ 2,900	108,395	163,466
Proceeds from the issuance of senior unsecured term loan			100,000	0
Borrowings under senior secured revolving credit facility				35,000
Repayments of borrowings under senior secured revolving credit facility			0	(35,000)
Proceeds from the issuance of senior unsecured term loan			150,000	45,000
Payments on unsecured revolving credit facility			(92,000)	0
Payments on the mortgage notes payable			(95,022)	(2,509)
Payments of deferred financing costs			(1,352)	(2,113)
Net-settle adjustment on restricted stock			(515)	(145)
Dividends paid on common stock			(27,396)	(14,086)
Distribution to Parent			0	0
Intercompany financing			0	0
Net cash provided by financing activities			142,110	189,613
Net increase (decrease) in cash and cash equivalents			411	(13,222)
Cash and cash equivalents beginning of period			11,467	25,320
Cash and cash equivalents end of period		11,878	11,878	12,098
Reportable Legal Entities [Member] | Parent Guarantor [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities			(73)	(239)
Cash flows from investing activities:
Acquisitions of real estate			0	0
Improvements to real estate			0	0
Purchases of equipment, furniture and fixtures			0	0
Preferred equity investments			0
Escrow deposit for acquisition of real estate			0
Net proceeds from sale of vacant land				0
Distribution from subsidiary			27,396	14,086
Intercompany financing			(107,807)	(163,082)
Net cash used in investing activities			(80,411)	(148,996)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net			108,395	163,466
Proceeds from the issuance of senior unsecured term loan			0
Borrowings under senior secured revolving credit facility				0
Repayments of borrowings under senior secured revolving credit facility				0
Proceeds from the issuance of senior unsecured term loan			0	0
Payments on unsecured revolving credit facility			0
Payments on the mortgage notes payable			0	0
Payments of deferred financing costs			0	0
Net-settle adjustment on restricted stock			(515)	(145)
Dividends paid on common stock			(27,396)	(14,086)
Distribution to Parent			0	0
Intercompany financing			0	0
Net cash provided by financing activities			80,484	149,235
Net increase (decrease) in cash and cash equivalents			0	0
Cash and cash equivalents beginning of period			0	0
Cash and cash equivalents end of period		0	0	0
Reportable Legal Entities [Member] | Issuers [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities			8,332	(7,997)
Cash flows from investing activities:
Acquisitions of real estate			(185,284)	(231,501)
Improvements to real estate			(56)	(20)
Purchases of equipment, furniture and fixtures			(70)	(186)
Preferred equity investments			0
Escrow deposit for acquisition of real estate			(1,000)
Net proceeds from sale of vacant land				0
Distribution from subsidiary			0	0
Intercompany financing			(58,570)	34,599
Net cash used in investing activities			(244,980)	(197,108)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net			0	0
Proceeds from the issuance of senior unsecured term loan			100,000
Borrowings under senior secured revolving credit facility				35,000
Repayments of borrowings under senior secured revolving credit facility				(35,000)
Proceeds from the issuance of senior unsecured term loan			150,000	45,000
Payments on unsecured revolving credit facility			(92,000)
Payments on the mortgage notes payable			0	0
Payments of deferred financing costs			(1,352)	(2,113)
Net-settle adjustment on restricted stock			0	0
Dividends paid on common stock			0	0
Distribution to Parent			(27,396)	(14,086)
Intercompany financing			107,807	163,082
Net cash provided by financing activities			237,059	191,883
Net increase (decrease) in cash and cash equivalents			411	(13,222)
Cash and cash equivalents beginning of period			11,467	25,320
Cash and cash equivalents end of period		11,878	11,878	12,098
Reportable Legal Entities [Member] | Combined Subsidiary Guarantors [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities			33,993	33,181
Cash flows from investing activities:
Acquisitions of real estate			0	0
Improvements to real estate			(202)	(123)
Purchases of equipment, furniture and fixtures			(69)	(70)
Preferred equity investments			(4,531)
Escrow deposit for acquisition of real estate			0
Net proceeds from sale of vacant land				30
Distribution from subsidiary			0	0
Intercompany financing			0	0
Net cash used in investing activities			(4,802)	(163)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net			0	0
Proceeds from the issuance of senior unsecured term loan			0
Borrowings under senior secured revolving credit facility				0
Repayments of borrowings under senior secured revolving credit facility				0
Proceeds from the issuance of senior unsecured term loan			0	0
Payments on unsecured revolving credit facility			0
Payments on the mortgage notes payable			0	(558)
Payments of deferred financing costs			0	0
Net-settle adjustment on restricted stock			0	0
Dividends paid on common stock			0	0
Distribution to Parent			0	0
Intercompany financing			(29,191)	(32,460)
Net cash provided by financing activities			(29,191)	(33,018)
Net increase (decrease) in cash and cash equivalents			0	0
Cash and cash equivalents beginning of period			0	0
Cash and cash equivalents end of period		0	0	0
Reportable Legal Entities [Member] | Combined Non-Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities			7,261	4,090
Cash flows from investing activities:
Acquisitions of real estate			0	0
Improvements to real estate			0	0
Purchases of equipment, furniture and fixtures			0	0
Preferred equity investments			0
Escrow deposit for acquisition of real estate			0
Net proceeds from sale of vacant land				0
Distribution from subsidiary			0	0
Intercompany financing			0	0
Net cash used in investing activities			0	0
Cash flows from financing activities:
Proceeds from the issuance of common stock, net			0	0
Proceeds from the issuance of senior unsecured term loan			0
Borrowings under senior secured revolving credit facility				0
Repayments of borrowings under senior secured revolving credit facility				0
Proceeds from the issuance of senior unsecured term loan			0	0
Payments on unsecured revolving credit facility			0
Payments on the mortgage notes payable			(95,022)	(1,951)
Payments of deferred financing costs			0	0
Net-settle adjustment on restricted stock			0	0
Dividends paid on common stock			0	0
Distribution to Parent			0	0
Intercompany financing			87,761	(2,139)
Net cash provided by financing activities			(7,261)	(4,090)
Net increase (decrease) in cash and cash equivalents			0	0
Cash and cash equivalents beginning of period			0	0
Cash and cash equivalents end of period		0	0	0
Elimination [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities			0	0
Cash flows from investing activities:
Acquisitions of real estate			0	0
Improvements to real estate			0	0
Purchases of equipment, furniture and fixtures			0	0
Preferred equity investments			0
Escrow deposit for acquisition of real estate			0
Net proceeds from sale of vacant land				0
Distribution from subsidiary			(27,396)	(14,086)
Intercompany financing			166,377	128,483
Net cash used in investing activities			138,981	114,397
Cash flows from financing activities:
Proceeds from the issuance of common stock, net			0	0
Proceeds from the issuance of senior unsecured term loan			0
Borrowings under senior secured revolving credit facility				0
Repayments of borrowings under senior secured revolving credit facility				0
Proceeds from the issuance of senior unsecured term loan			0	0
Payments on unsecured revolving credit facility			0
Payments on the mortgage notes payable			0	0
Payments of deferred financing costs			0	0
Net-settle adjustment on restricted stock			0	0
Dividends paid on common stock			0	0
Distribution to Parent			27,396	14,086
Intercompany financing			(166,377)	(128,483)
Net cash provided by financing activities			(138,981)	(114,397)
Net increase (decrease) in cash and cash equivalents			0	0
Cash and cash equivalents beginning of period			0	0
Cash and cash equivalents end of period		$ 0	$ 0	$ 0