Common Stock and Other Equity Related Transactions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Class of Stock [Line Items]
Common stock, par value (usd per share)	$ 0.01		$ 0.01
OP units were exchanged for an equal number of shares of common stock (OP Units)	5,325	6,838
Private Placement
Class of Stock [Line Items]
Common stock, par value (usd per share)	$ 0.01
Aggregate offering price	$ 200.0

The number of shares issued during the period upon the conversion of units. An example of a convertible unit is an umbrella partnership real estate investment trust unit (UPREIT unit).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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Balance Type:	na
Period Type:	duration