Equity - Summary of Changes In Stockholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Shareholders Equity [Line Items]
Balance	$ 1,299,970	$ 1,199,841
Stock based compensation	1,334	1,000
Dividends and distributions paid	(24,186)	(22,086)
Issuance of common stock	39,958	4,825
Contribution of Property for common units		21,550
Unrealized gain (loss) on interest rate swaps, net	1,838	(9,846)
Net income	7,880	1,918
Balance	$ 1,326,794	$ 1,197,202
Balance (in shares)	83,856,953
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	$ 821	$ 748
Balance (in shares)	82,106,256	74,832,292
Grant of unvested restricted stock	4,462	2,905
Redemption of common units for shares of common stock	$ 2	$ 1
Redemption of common units for shares of common stock (in shares)	189,411	42,000
Issuance of common stock	$ 16	$ 2
Issuance of common stock (in share)	1,556,824	200,000
Balance	$ 839	$ 751
Balance (in shares)	83,856,953	75,077,197
Additional Paid-in Capital [Member]
Shareholders Equity [Line Items]
Balance	$ 1,424,787	$ 1,257,319
Stock based compensation	218	224
Redemption of common units for shares of common stock	2,662	596
Issuance of common stock	39,942	4,823
Allocation of non-controlling interest in Operating Partnership	(3,595)	7,796
Balance	1,464,014	1,270,758
Retained Earnings [Member]
Shareholders Equity [Line Items]
Balance	31,965	20,004
Net income	6,991	1,697
Balance	38,956	$ 21,701
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	(291,652)	$ (210,760)
Dividends and distributions paid	(21,355)	(19,516)
Balance	(313,007)	(230,276)
Accumulated Other Comprehensive Income (Loss) [Member]
Shareholders Equity [Line Items]
Balance	(11,351)	(4,690)
Unrealized gain (loss) on interest rate swaps, net	1,610	(8,586)
Balance	(9,741)	(13,276)
Non-controlling Interest in Operating Partnership [Member]
Shareholders Equity [Line Items]
Balance	145,400	137,220
Stock based compensation	1,116	776
Dividends and distributions paid	(2,831)	(2,570)
Redemption of common units for shares of common stock	(2,664)	(597)
Contribution of Property for common units		21,550
Unrealized gain (loss) on interest rate swaps, net	228	(1,260)
Net income	889	221
Allocation of non-controlling interest in Operating Partnership	3,595	(7,796)
Balance	$ 145,733	$ 147,544