Real Estate and Other Activities - Development Activities - Summary of Status on Current Development and Capital Additions Projects (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($)
Business Acquisition [Line Items]
Commitment	$ 177,119
Costs Paid as of September 30, 2025	97,334
Cost Remaining	79,785
IMED Hospitales ("IMED") [Member] | Spain [Member]
Business Acquisition [Line Items]
Commitment	65,952
Costs Paid as of September 30, 2025	49,820
Cost Remaining	16,132
IMED [Member] | Spain [Member]
Business Acquisition [Line Items]
Commitment	42,780
Costs Paid as of September 30, 2025	42,594
Cost Remaining	186
HSA [Member] | Florida [Member]
Business Acquisition [Line Items]
Commitment	43,500
Costs Paid as of September 30, 2025	4,421
Cost Remaining	39,079
NOR | California [Member]
Business Acquisition [Line Items]
Commitment	24,333
Costs Paid as of September 30, 2025	289
Cost Remaining	24,044
Other [Member] | Various [Member]
Business Acquisition [Line Items]
Commitment	554
Costs Paid as of September 30, 2025	210
Cost Remaining	$ 344