Real Estate and Lending Activities - Summary of Status Update on Current Development Projects (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Business Acquisition [Line Items]
Original Commitment	$ 118,046
Costs Incurred as of March 31, 2014	43,956
Property Oakleaf Surgical Hospital [Member] | Location Altoona, WI [Member] | Property Type Acute Care Hospital [Member] | Operator National Surgical Hospitals [Member]
Business Acquisition [Line Items]
Original Commitment	33,500
Costs Incurred as of March 31, 2014	22,780
Estimated Completion Date	3Q 2014
Property First Choice ER - Brodie [Member] | Location Austin, TX [Member] | Property Type Acute Care Hospital [Member] | Operator First Choice ER, LLC [Member]
Business Acquisition [Line Items]
Original Commitment	5,466
Costs Incurred as of March 31, 2014	2,829
Estimated Completion Date	2Q 2014
Property First Choice ER - Briar Forest [Member] | Location Houston, TX [Member] | Property Type Acute Care Hospital [Member] | Operator First Choice ER, LLC [Member]
Business Acquisition [Line Items]
Original Commitment	5,844
Costs Incurred as of March 31, 2014	1,595
Estimated Completion Date	3Q 2014
Property First Choice ER - Cedar Hill [Member] | Location Cedar Hill, TX [Member] | Property Type Acute Care Hospital [Member] | Operator First Choice ER, LLC [Member]
Business Acquisition [Line Items]
Original Commitment	5,769
Costs Incurred as of March 31, 2014	1,710
Estimated Completion Date	3Q 2014
Property First Choice ER- Firestone [Member] | Location Firestone, CO [Member] | Property Type Acute Care Hospital [Member] | Operator First Choice ER, LLC [Member]
Business Acquisition [Line Items]
Original Commitment	5,173
Costs Incurred as of March 31, 2014	1,699
Estimated Completion Date	3Q 2014
Property First Choice ER - Allen [Member] | Location Allen, TX [Member] | Property Type Acute Care Hospital [Member] | Operator First Choice ER, LLC [Member]
Business Acquisition [Line Items]
Original Commitment	6,187
Costs Incurred as of March 31, 2014	2,042
Estimated Completion Date	3Q 2014
Property First Choice ER - Frisco [Member] | Location Frisco, TX [Member] | Property Type Acute Care Hospital [Member] | Operator First Choice ER, LLC [Member]
Business Acquisition [Line Items]
Original Commitment	5,893
Costs Incurred as of March 31, 2014	2,060
Estimated Completion Date	3Q 2014
Property First Choice ER - Broomfield [Member] | Location Broomfield, CO [Member] | Property Type Acute Care Hospital [Member] | Operator First Choice ER, LLC [Member]
Business Acquisition [Line Items]
Original Commitment	5,238
Costs Incurred as of March 31, 2014	1,118
Estimated Completion Date	3Q 2014
Property First Choice ER - Spring [Member] | Location Spring, TX [Member] | Property Type Acute Care Hospital [Member] | Operator First Choice ER, LLC [Member]
Business Acquisition [Line Items]
Original Commitment	5,804
Costs Incurred as of March 31, 2014	1,804
Estimated Completion Date	3Q 2014
Property First Choice ER - North Gate [Member] | Location Colorado Springs, CO [Member] | Property Type Acute Care Hospital [Member] | Operator First Choice ER, LLC [Member]
Business Acquisition [Line Items]
Original Commitment	5,249
Costs Incurred as of March 31, 2014	896
Estimated Completion Date	3Q 2014
Property First Choice ER - Fountain [Member] | Location Fountain, CO [Member] | Property Type Acute Care Hospital [Member] | Operator First Choice ER, LLC [Member]
Business Acquisition [Line Items]
Original Commitment	6,194
Costs Incurred as of March 31, 2014	1,558
Estimated Completion Date	3Q 2014
Property First Choice ER - Missouri City (Sienna) [Member] | Location Houston, TX [Member] | Property Type Acute Care Hospital [Member] | Operator First Choice ER, LLC [Member]
Business Acquisition [Line Items]
Original Commitment	5,394
Costs Incurred as of March 31, 2014	1,062
Estimated Completion Date	3Q 2014
Property First Choice ER - Pearland [Member] | Location Pearland, TX [Member] | Property Type Acute Care Hospital [Member] | Operator First Choice ER, LLC [Member]
Business Acquisition [Line Items]
Original Commitment	5,691
Costs Incurred as of March 31, 2014	1,403
Estimated Completion Date	4Q 2014
Property First Choice ER - Thornton [Member] | Location Thomton, CO [Member] | Property Type Acute Care Hospital [Member] | Operator First Choice ER, LLC [Member]
Business Acquisition [Line Items]
Original Commitment	6,029
Costs Incurred as of March 31, 2014	1,400
Estimated Completion Date	4Q 2014
Property First Choice ER [Member] | Location Various [Member] | Property Type Acute Care Hospital [Member] | Operator First Choice ER, LLC [Member]
Business Acquisition [Line Items]
Original Commitment	10,615
Costs Incurred as of March 31, 2014