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Stockholders' Equity - Additional Information (Detail) - USD ($)				1 Months Ended		3 Months Ended		6 Months Ended
	Mar. 01, 2021	Dec. 14, 2020	Mar. 02, 2020	Feb. 28, 2021	Mar. 31, 2018	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Shareholders Equity [Line Items]
Payment of regular quarterly dividend								$ 35,022,000	$ 31,189,000
Regular quarterly dividends paid per share								$ 0.78	$ 0.74
Shares issued pursuant to dividend reinvestment, shares								1,258	13,027
Proceeds from issuance of common stock under the dividend reinvestment plan								$ 36,000	$ 410,000
Stock based compensation expense								$ 1,937,000	$ 1,600,000
Common Stock [Member]
Shareholders Equity [Line Items]
Shares issued pursuant to dividend reinvestment, shares							1,000	1,000	13,000
2018 ATM Program [Member] | Common Stock [Member]
Shareholders Equity [Line Items]
Shares issued pursuant to Offering/Program net, shares						289,000	404,000	1,032,000	404,000
Proceeds from issuance of shares						$ 9,312,000	$ 11,916,000	$ 29,578,000	$ 11,916,000
2018 ATM Program [Member] | Maximum [Member]
Shareholders Equity [Line Items]
Aggregate sales price					$ 125,000,000
ATM Program [Member]
Shareholders Equity [Line Items]
Proceeds from issuance of shares								$ 29,578,000	$ 11,916,000
ATM Program [Member] | Common Stock [Member]
Shareholders Equity [Line Items]
Shares issued pursuant to Offering/Program net, shares						289,000	404,000	1,032,000	404,000
ATM Program [Member] | Maximum [Member]
Shareholders Equity [Line Items]
Aggregate sales price				$ 250,000,000
Amended and Restated 2004 Omnibus Incentive Compensation Plan [Member] | Restricted Stock Units [Member]
Shareholders Equity [Line Items]
Restricted stock units, granted	192,550	15,000	176,050

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