Other assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Acquired in-place leases	$ 632,075	$ 462,324
Deferred compensation plan	39,453	31,057
Deferred financing costs – unsecured senior line of credit	20,499	24,124
Deposits	161,793	13,861
Furniture, fixtures, and equipment	27,333	31,130
Net investment in direct financing and sales-type leases	70,396	37,840
Notes receivable	12,024	3,424
Operating lease right-of-use asset	395,892	335,920
Other assets	53,970	30,620
Prepaid expenses	30,960	67,667
Property, plant, and equipment	152,220	153,614
Total	$ 1,596,615	$ 1,191,581