Summarized Condensed Consolidating Information - Condensed Consolidating Statements of Cash Flows (Detail) - USD ($) $ in Thousands		6 Months Ended
	Mar. 28, 2016	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net cash provided by operating activities		$ 28,113	$ 15,586
Cash flows from investing activities:
Acquisitions of real estate		(144,149)	(33,646)
Improvements to real estate		(170)	(143)
Purchases of equipment, furniture and fixtures		(89)	(227)
Escrow deposits for acquisition of real estate		0	(1,500)
Distribution from subsidiary		0	0
Intercompany financing		0	0
Net cash used in investing activities		(144,408)	(35,516)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net	$ 105,800	105,889	0
Proceeds from the issuance of senior unsecured term loan		100,000	0
Borrowings under senior secured revolving credit facility			35,000
Proceeds from the issuance of senior unsecured term loan		115,000	0
Payments on unsecured credit facility		(92,000)	0
Payments on the mortgage notes payable		(95,022)	(1,351)
Payments of deferred financing costs		(1,332)	(139)
Net-settle adjustment on restricted stock		(515)	0
Dividends paid on common stock		(17,548)	(8,996)
Distribution to Parent		0	0
Intercompany financing		0	0
Net cash provided by financing activities		114,472	24,514
Net (decrease) increase in cash and cash equivalents		(1,823)	4,584
Cash and cash equivalents beginning of period		11,467	25,320
Cash and cash equivalents end of period		9,644	29,904
Reportable Legal Entities [Member] | Parent Guarantor [Member]
Cash flows from operating activities:
Net cash provided by operating activities		466	(149)
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
Escrow deposits for acquisition of real estate			0
Distribution from subsidiary		17,548	8,996
Intercompany financing		(105,840)	149
Net cash used in investing activities		(88,292)	9,145
Cash flows from financing activities:
Proceeds from the issuance of common stock, net		105,889
Proceeds from the issuance of senior unsecured term loan		0
Borrowings under senior secured revolving credit facility			0
Proceeds from the issuance of senior unsecured term loan		0
Payments on unsecured 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)
Dividends paid on common stock		(17,548)	(8,996)
Distribution to Parent		0	0
Intercompany financing		0	0
Net cash provided by financing activities		87,826	(8,996)
Net (decrease) increase 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
Reportable Legal Entities [Member] | Issuers [Member]
Cash flows from operating activities:
Net cash provided by operating activities		396	(8,782)
Cash flows from investing activities:
Acquisitions of real estate		(144,149)	(33,646)
Improvements to real estate		(56)	(20)
Purchases of equipment, furniture and fixtures		(31)	(167)
Escrow deposits for acquisition of real estate			(1,500)
Distribution from subsidiary		0	0
Intercompany financing		(67,943)	22,983
Net cash used in investing activities		(212,179)	(12,350)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net		0
Proceeds from the issuance of senior unsecured term loan		100,000
Borrowings under senior secured revolving credit facility			35,000
Proceeds from the issuance of senior unsecured term loan		115,000
Payments on unsecured credit facility		(92,000)
Payments on the mortgage notes payable		0	0
Payments of deferred financing costs		(1,332)	(139)
Net-settle adjustment on restricted stock		0
Dividends paid on common stock		0	0
Distribution to Parent		(17,548)	(8,996)
Intercompany financing		105,840	(149)
Net cash provided by financing activities		209,960	25,716
Net (decrease) increase in cash and cash equivalents		(1,823)	4,584
Cash and cash equivalents beginning of period		11,467	25,320
Cash and cash equivalents end of period		9,644	29,904
Reportable Legal Entities [Member] | Combined Subsidiary Guarantors [Member]
Cash flows from operating activities:
Net cash provided by operating activities		22,734	21,801
Cash flows from investing activities:
Acquisitions of real estate		0	0
Improvements to real estate		(114)	(123)
Purchases of equipment, furniture and fixtures		(58)	(60)
Escrow deposits for acquisition of real estate			0
Distribution from subsidiary		0	0
Intercompany financing		0	0
Net cash used in investing activities		(172)	(183)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net		0
Proceeds from the issuance of senior unsecured term loan		0
Borrowings under senior secured revolving credit facility			0
Proceeds from the issuance of senior unsecured term loan		0
Payments on unsecured credit facility		0
Payments on the mortgage notes payable		0	(50)
Payments of deferred financing costs		0	0
Net-settle adjustment on restricted stock		0
Dividends paid on common stock		0	0
Distribution to Parent		0	0
Intercompany financing		(22,562)	(21,568)
Net cash provided by financing activities		(22,562)	(21,618)
Net (decrease) increase 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
Reportable Legal Entities [Member] | Combined Non-Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net cash provided by operating activities		4,517	2,716
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
Escrow deposits for acquisition of real estate			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
Proceeds from the issuance of senior unsecured term loan		0
Borrowings under senior secured revolving credit facility			0
Proceeds from the issuance of senior unsecured term loan		0
Payments on unsecured credit facility		0
Payments on the mortgage notes payable		(95,022)	(1,301)
Payments of deferred financing costs		0	0
Net-settle adjustment on restricted stock		0
Dividends paid on common stock		0	0
Distribution to Parent		0	0
Intercompany financing		90,505	(1,415)
Net cash provided by financing activities		(4,517)	(2,716)
Net (decrease) increase 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
Elimination [Member]
Cash flows from operating activities:
Net cash 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
Escrow deposits for acquisition of real estate			0
Distribution from subsidiary		(17,548)	(8,996)
Intercompany financing		173,783	(23,132)
Net cash used in investing activities		156,235	(32,128)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net		0
Proceeds from the issuance of senior unsecured term loan		0
Borrowings under senior secured revolving credit facility			0
Proceeds from the issuance of senior unsecured term loan		0
Payments on unsecured 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
Dividends paid on common stock		0	0
Distribution to Parent		17,548	8,996
Intercompany financing		(173,783)	23,132
Net cash provided by financing activities		(156,235)	32,128
Net (decrease) increase 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