Quarterly report pursuant to Section 13 or 15(d)

Recent Accounting Pronouncements - Additional Information (Detail)

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Recent Accounting Pronouncements - Additional Information (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
Property
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Number of properties acquired | Property 2
Land and Building [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Accumulated operating leases, aggregate annual minimum payments | $ $ 3
Revenue [Member] | Product Concentration [Member] | Revenue From Rental Products [Member] | Minimum [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Concentration risk, percentage 90.00%