Equity - Common Stock (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Jun. 13, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Class of Stock [Line Items]
Offering costs		$ 23	$ 3,837	$ 2,977	$ 11,276
Underwritten Public Offering
Class of Stock [Line Items]
Issuance of common stock (in shares)		7,187,500
Common stock share price (in dollars per share)		$ 39.85		$ 39.85
Net proceeds from issuance of common stock		$ 285,100
Offering costs		$ 1,400
Underwritten Public Offering, Option Securities
Class of Stock [Line Items]
Issuance of common stock (in shares)		937,500
At The Market Equity Offering Program, $550 Million
Class of Stock [Line Items]
Issuance of common stock (in shares)				2,455,770
Common stock share price (in dollars per share)		$ 37.02		$ 37.02
Net proceeds from issuance of common stock				$ 89,600
Maximum aggregate offering amount	$ 550,000
Gross proceeds from the issuance of common stock				90,900
Shares available under ATM (in shares)		$ 259,800		$ 259,800
OP Units | Partnership Interest | Noncontrolling Interests
Class of Stock [Line Items]
Operating partnership units exchanged for (in shares)		7,187,500