Schedule III - Real Estate and Accumulated Depreciation - Carrying Amount of Real Estate Properties and Accumulated Depreciation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020		Dec. 31, 2019	Dec. 31, 2018
Real Estate Properties
Balance at beginning of year	$ 2,144,795		$ 1,732,446	$ 1,298,552
Additions	285,882		426,516	433,894
Dispositions	(8,803)		(14,167)
Balance at ending of year	2,421,874	[1]	2,144,795	1,732,446
Accumulated Depreciation
Balance at beginning of year	156,069		105,829	68,390
Additions	58,437		51,132	37,439
Dispositions	(1,293)		(892)
Balance at ending of year	$ 213,213	[2]	$ 156,069	$ 105,829

[1] Excludes value of real estate intangibles.

[2] Depreciation of real estate property is computed on a straight-line basis over the estimated useful lives of the assets. The estimated lives of our assets range from 5 to 40 years or to the term of the underlying lease