Organization and Nature of Business - Additional Information (Detail) $ in Millions	1 Months Ended	6 Months Ended
	Apr. 30, 2017 USD ($)	Jun. 30, 2017	Mar. 24, 2017 Property
Disposal Group, Not Discontinued Operations
Organization And Nature Of Business [Line Items]
Number of properties held-for-sale | Property			36
Consideration	$ 830.0
Proceeds from sale of properties	182.6
Common stock received as consideration	$ 647.4
Minimum
Organization And Nature Of Business [Line Items]
Long-term lease (in years)		5 years
Maximum
Organization And Nature Of Business [Line Items]
Long-term lease (in years)		20 years