Condensed Combined Statement of Income for Limited Liabilities Accounted for under Equity Method (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	[1]
Equity Method Investments And Joint Ventures [Abstract]
Revenues		$ 15,252	$ 14,347	$ 17,292
Operating expenses		5,439	5,605	6,769
Depreciation and amortization		2,554	2,398	2,968
Interest, net		2,565	2,578	4,261
Net income		4,694	3,766	3,294
Our share of net income	[2]	$ 4,456	$ 2,536	$ 2,428

[1] As mentioned above, we began to account for six LLCs (Desert Valley Medical Center, Santa Fe Professional Plaza, Rosenberg Children’s Medical Plaza, Sierra San Antonio Medical Plaza, Phoenix Children’s East Valley Care Center and North Valley Medical Plaza) on a consolidated basis as of August 1, 2014. Prior to August 1, 2014, the financial results of these entities were accounted for under the equity method on an unconsolidated basis. The year ended December 31, 2014 includes the financial results of the six mentioned LLCs for seven months ended July 31, 2014.

[2] Our share of net income during 2016, 2015 and 2014, includes interest income earned by us on various advances made to LLCs of approximately $1.2 million, $200,000 and $834,000, respectively.