Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		6 Months Ended		12 Months Ended
	Dec. 14, 2022	Jun. 30, 2018	Dec. 31, 2015	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Conversion of common shares		3,150,281
Class A Common Shares [Member]
Class of Stock [Line Items]
Common shares, issued		35,678,749		32,415,734
Common shares, outstanding		35,678,749		32,415,734	27,924,000	25,843,000
Class B Non-Economic Common Shares [Member] | ESL [Member]
Class of Stock [Line Items]
Common shares, issued		1,322,365
Common shares, outstanding		1,322,365
Common shares surrendered		6,501
Class C Non Voting Common Shares [Member]
Class of Stock [Line Items]
Conversion of common shares		3,150,281	850
Common shares, issued		850
Common shares, outstanding		850
Series A Cumulative Redeemable Preferred Shares [Member]
Class of Stock [Line Items]
Preferred shares, issued				2,800,000
Percentage of preferred dividend rate				7.00%
Preferred shares public offering price per share				$ 25.00
Net proceeds from public offering				$ 66.7
Series A Cumulative Redeemable Preferred Shares [Member] | Scenario, Forecast [Member]
Class of Stock [Line Items]
Preferred shares redemption price per share plus any accrued and unpaid dividends	$ 25.00
Series A Cumulative Redeemable Preferred Shares [Member] | Scenario, Forecast [Member] | Maximum [Member]
Class of Stock [Line Items]
Preferred shares redemption threshold period	120 days