Summarized Condensed Consolidating Information - Condensed Consolidating Statements of Cash Flows (Detail) - USD ($) $ in Thousands		3 Months Ended
	Mar. 28, 2016	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net cash (used in) provided by operating activities		$ 14,994	$ 11,055
Cash flows from investing activities:
Acquisitions of real estate		(68,000)	(17,499)
Improvements to real estate		(27)	(74)
Purchases of equipment, furniture and fixtures		(17)	(63)
Escrow deposits for acquisition of real estate		(15,730)	(500)
Distribution from subsidiary		0	0
Intercompany financing		0	0
Net cash used in investing activities		(83,774)	(18,136)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net	$ 105,700	106,026	0
Proceeds from the issuance of senior unsecured term loan		100,000	0
Proceeds from the issuance of senior unsecured term loan		52,000	0
Payments on unsecured credit facility		(92,000)	0
Payments on the mortgage notes payable		(95,022)	(685)
Payments of deferred financing costs		(1,324)	(14)
Dividends paid on common stock		(7,704)	(3,946)
Distribution to Parent		0	0
Intercompany financing		0	0
Net cash provided by (used in) financing activities		61,976	(4,645)
Net decrease in cash and cash equivalents		(6,804)	(11,726)
Cash and cash equivalents beginning of period		11,467	25,320
Cash and cash equivalents end of period		4,663	13,594
Reportable Legal Entities [Member] | Parent Guarantor [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities		(2)	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	0
Distribution from subsidiary		7,704	3,946
Intercompany financing		(106,024)	0
Net cash used in investing activities		(98,320)	3,946
Cash flows from financing activities:
Proceeds from the issuance of common stock, net		106,026
Proceeds from the issuance of senior unsecured term loan		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
Dividends paid on common stock		(7,704)	(3,946)
Distribution to Parent		0	0
Intercompany financing		0	0
Net cash provided by (used in) financing activities		98,322	(3,946)
Net 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
Reportable Legal Entities [Member] | Issuers [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities		2,013	(824)
Cash flows from investing activities:
Acquisitions of real estate		(68,000)	(17,499)
Improvements to real estate		0	(19)
Purchases of equipment, furniture and fixtures		0	(7)
Escrow deposits for acquisition of real estate		(15,730)	(500)
Distribution from subsidiary		0	0
Intercompany financing		(82,083)	11,083
Net cash used in investing activities		(165,813)	(6,942)
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
Proceeds from the issuance of senior unsecured term loan		52,000
Payments on unsecured credit facility		(92,000)
Payments on the mortgage notes payable		0	0
Payments of deferred financing costs		(1,324)	(14)
Dividends paid on common stock		0	0
Distribution to Parent		(7,704)	(3,946)
Intercompany financing		106,024	0
Net cash provided by (used in) financing activities		156,996	(3,960)
Net decrease in cash and cash equivalents		(6,804)	(11,726)
Cash and cash equivalents beginning of period		11,467	25,320
Cash and cash equivalents end of period		4,663	13,594
Reportable Legal Entities [Member] | Combined Subsidiary Guarantors [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities		11,193	10,496
Cash flows from investing activities:
Acquisitions of real estate		0	0
Improvements to real estate		(27)	(55)
Purchases of equipment, furniture and fixtures		(17)	(56)
Escrow deposits for acquisition of real estate		0	0
Distribution from subsidiary		0	0
Intercompany financing		0	0
Net cash used in investing activities		(44)	(111)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net		0
Proceeds from the issuance of senior unsecured term loan		0
Proceeds from the issuance of senior unsecured term loan		0
Payments on unsecured credit facility		0
Payments on the mortgage notes payable		0	(25)
Payments of deferred financing costs		0	0
Dividends paid on common stock		0	0
Distribution to Parent		0	0
Intercompany financing		(11,149)	(10,360)
Net cash provided by (used in) financing activities		(11,149)	(10,385)
Net 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
Reportable Legal Entities [Member] | Combined Non-Guarantor Subsidiaries [Member]
Cash flows from operating activities:
Net cash (used in) provided by operating activities		1,790	1,383
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	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
Proceeds from the issuance of senior unsecured term loan		0
Payments on unsecured credit facility		0
Payments on the mortgage notes payable		(95,022)	(660)
Payments of deferred financing costs		0	0
Dividends paid on common stock		0	0
Distribution to Parent		0	0
Intercompany financing		93,232	(723)
Net cash provided by (used in) financing activities		(1,790)	(1,383)
Net 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
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
Escrow deposits for acquisition of real estate		0	0
Distribution from subsidiary		(7,704)	(3,946)
Intercompany financing		188,107	(11,083)
Net cash used in investing activities		180,403	(15,029)
Cash flows from financing activities:
Proceeds from the issuance of common stock, net		0
Proceeds from the issuance of senior unsecured term loan		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
Dividends paid on common stock		0	0
Distribution to Parent		7,704	3,946
Intercompany financing		(188,107)	11,083
Net cash provided by (used in) financing activities		(180,403)	15,029
Net 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