Equity - Additional Information (Detail) - USD ($)						3 Months Ended
	Dec. 20, 2020	Mar. 26, 2020	Mar. 23, 2020	Jan. 03, 2020	Mar. 04, 2019	Mar. 31, 2020	Dec. 31, 2019
Stockholders Equity Note Disclosure [Line Items]
Unrecognized compensation expense						$ 7,700,000
Contribution of property for common units, partial consideration		870,730
2015 Equity Incentive Plan [Member]
Stockholders Equity Note Disclosure [Line Items]
Compensation expense recognized						$ 1,000,000.0
2015 Equity Incentive Plan [Member] | Employee [Member]
Stockholders Equity Note Disclosure [Line Items]
Restricted common stock issued			2,905
Restricted common stock grants, vesting description						The shares of restricted common stock will vest upon the second anniversary of the grant date so long as the grantee remains an employee of the Company on such date
2017 and 2019 ATM Programs [Member]
Stockholders Equity Note Disclosure [Line Items]
Aggregate offering price of shares of common stock that the Company may issue and sell					$ 200,000,000.0
December 2019 ATM Program [Member]
Stockholders Equity Note Disclosure [Line Items]
Aggregate offering price of shares of common stock that the Company may issue and sell	$ 300,000,000.0
March 2019 ATM Program [Member]
Stockholders Equity Note Disclosure [Line Items]
Gross sale of common stock available for grant						$ 99,000,000.0
December 2019 ATM Program [Member]
Stockholders Equity Note Disclosure [Line Items]
Gross sale of common stock available for grant							$ 300,000,000.0
Restricted Common Stock [Member]
Stockholders Equity Note Disclosure [Line Items]
Percentage of awards vesting when earned following completion of applicable performance period				50.00%
Percentage of awards earned subject to additional year of vesting				50.00%
Aggregate Service-based units granted						235,441
Restricted Common Stock [Member] | 2015 Equity Incentive Plan [Member]
Stockholders Equity Note Disclosure [Line Items]
Aggregate performance-based units granted				146,199
Aggregate Service-based units granted				89,242
Restricted Common Stock [Member] | Tranche One [Member]
Stockholders Equity Note Disclosure [Line Items]
Aggregate performance-based units granted				81,693
Restricted Common Stock [Member] | Tranche Two [Member]
Stockholders Equity Note Disclosure [Line Items]
Aggregate performance-based units granted				64,506