Incentive Plans - Additional Information (Detail) - Incentive Plan 2007 - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Equity Incentive Plan [Line Items]
Number of shares authorized for issuance	275,000
Shares issued, net of cancellation	182,638
Number of shares vested	142,269
Number of shares remaining for issuance	92,362
Restricted shares issued, net of cancellation	23,265	17,104	15,064
Restricted shares issued, weighted average grant price	$ 38.24	$ 48.48	$ 52.3
Restricted shares of beneficial interest, net of cancellations, issued, value	$ 890,000	$ 829,000	$ 788,000
Restricted shares, Vesting Period			2024-06
Compensation expense	853,000	$ 780,000	$ 780,000
Compensation expense remained to be recognized in future	$ 20,000
Compensation expense not yet recognized, period of recognition	1 year 2 months 12 days
Tranche One
Equity Incentive Plan [Line Items]
Restricted shares, Vesting Period	2026-06	2025-06