Equity - Summary of Changes In Stockholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Shareholders Equity [Line Items]
Balance	$ 1,326,794	$ 1,299,970	$ 1,197,202	$ 1,299,970	$ 1,199,841
Stock based compensation	1,033		1,021	2,367	2,021
Dividends and distributions paid	(24,591)		(22,317)	(48,777)	(44,403)
Issuance of common stock			103,229	39,958	108,054
Contribution of Property for common units	20,790			20,790	21,550
Unrealized gain (loss) on interest rate swaps, net	1,257		(266)	3,095	(10,112)
Net income	9,254		4,163	17,134	6,081
Balance	1,334,537	$ 1,326,794	1,283,032	1,334,537	$ 1,283,032
Balance (in shares)		83,931,290
Cumulative Effect, Period of Adoption, Adjustment [Member]
Shareholders Equity [Line Items]
Accounting Standards Update [Extensible List]					us-gaap:AccountingStandardsUpdate201613Member
Common Stock Par Value [Member]
Shareholders Equity [Line Items]
Balance	$ 839	$ 821	$ 751	$ 821	$ 748
Balance (in shares)	83,856,953	82,106,256	75,077,197	82,106,256	74,832,292
Grant of unvested restricted stock, net (in shares)	20,337			24,799
Redemption of common units for shares of common stock				$ 2	$ 1
Redemption of common units for shares of common stock (in shares)	54,000		86,960	243,411	128,960
Issuance of common stock			$ 45	$ 16	$ 47
Issuance of common stock (in share)			4,472,192	1,556,824	4,672,192
Balance	$ 839	$ 839	$ 797	$ 839	$ 797
Balance (in shares)	83,931,290		79,655,374	83,931,290	79,655,374
Grant of unvested restricted stock			$ 1		$ 1
Grant of unvested restricted stock (in shares)			19,025		21,930
Additional Paid-in Capital [Member]
Shareholders Equity [Line Items]
Balance	$ 1,464,014	1,424,787	$ 1,270,758	$ 1,424,787	$ 1,257,319
Stock based compensation	166		241	384	465
Redemption of common units for shares of common stock	760		1,215	3,422	1,811
Issuance of common stock			103,184	39,942	108,007
Allocation of non-controlling interest in Operating Partnership	6,988		(4,104)	3,393	3,692
Balance	1,471,928	1,464,014	1,371,293	1,471,928	1,371,293
Grant of unvested restricted stock			(1)		(1)
Retained Earnings [Member]
Shareholders Equity [Line Items]
Balance	38,956	31,965	21,701	31,965	20,004
Net income	8,201		3,666	15,192	5,363
Balance	47,157	38,956	25,367	47,157	$ 25,367
Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Shareholders Equity [Line Items]
Accounting Standards Update [Extensible List]					us-gaap:AccountingStandardsUpdate201613Member
Cumulative Dividends [Member]
Shareholders Equity [Line Items]
Balance	(313,007)	(291,652)	(230,276)	(291,652)	$ (210,760)
Dividends and distributions paid	(21,808)		(19,535)	(43,163)	(39,051)
Balance	(334,815)	(313,007)	(249,811)	(334,815)	(249,811)
Accumulated Other Comprehensive Income (Loss) [Member]
Shareholders Equity [Line Items]
Balance	(9,741)	(11,351)	(13,276)	(11,351)	(4,690)
Unrealized gain (loss) on interest rate swaps, net	1,202		(342)	2,812	(8,928)
Balance	(8,539)	(9,741)	(13,618)	(8,539)	(13,618)
Non-controlling Interest in Operating Partnership [Member]
Shareholders Equity [Line Items]
Balance	145,733	145,400	147,544	145,400	137,220
Stock based compensation	867		780	1,983	1,556
Dividends and distributions paid	(2,783)		(2,782)	(5,614)	(5,352)
Redemption of common units for shares of common stock	(760)		(1,215)	(3,424)	(1,812)
Contribution of Property for common units	20,790			20,790	21,550
Unrealized gain (loss) on interest rate swaps, net	55		76	283	(1,184)
Net income	1,053		497	1,942	718
Allocation of non-controlling interest in Operating Partnership	(6,988)		4,104	(3,393)	(3,692)
Balance	$ 157,967	$ 145,733	$ 149,004	$ 157,967	$ 149,004