Real Estate and Lending Activities - Gilbert and Florence Facilities - Additional Information (Detail) - USD ($) $ in Millions		9 Months Ended
Mar. 31, 2017	Sep. 30, 2018
Business Acquisition [Line Items]
Gain offset by non-cash charges	$ 0.6
Gilbert and Florence Facilities [Member]
Business Acquisition [Line Items]
Gain offset by non-cash charges		$ 1.1
Total budgeted investment		$ 37.5
Gilbert and Florence Facilities [Member] \| Total Gross Assets [Member] \| Credit Concentration Risk [Member]
Business Acquisition [Line Items]
Percentage of Total Gross Assets		0.40%

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No definition available.

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