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Concentration of Credit Risk - Schedule of Annualized Base Rent from Tenants at Consolidated Properties (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
ft²
Annualized Base Rent From Tenants At Consolidated Properties [Line Items]  
GLA (Sq Ft) 860,000
Prime Healthcare Services - Reno [Member]  
Annualized Base Rent From Tenants At Consolidated Properties [Line Items]  
Annual Base Rent | $ $ 3,863
Prime Healthcare Services - Reno [Domain]  
Annualized Base Rent From Tenants At Consolidated Properties [Line Items]  
Type Of Property Acquired Medical Office
GLA (Sq Ft) 152,000
Percentage of annual base rent 23.50%