Condensed Combined Statement of Income for Limited Liabilities Accounted for under Equity Method (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Equity Method Investments And Joint Ventures [Abstract]
Revenues		$ 3,583	$ 3,736
Operating expenses		1,250	1,353
Depreciation and amortization		643	613
Interest, net		562	657
Net income		1,128	1,113
Our share of net income	[1]	$ 1,077	$ 1,059

[1] Our share of net income for the three months ended March 31, 2017 and 2016 includes approximately $284,000 and $296,000, respectively, of interest income earned by us on an advance made to Arlington Medical Properties, LLC. This advance was repaid to us effective with the previously mentioned Arlington Medical Properties, LLC transaction during March, 2017.