Real Estate and Lending Activities - Summary of Status Update on Current Development Projects (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Business Acquisition [Line Items]
Original Commitment	$ 176,440
Costs Incurred as of September 30, 2013	41,633
Property Victoria Rehabilitation Hospital | Location Victoria, TX | Property Type Long-term Acute Care Hospital | Operator Post Acute Medical
Business Acquisition [Line Items]
Original Commitment	9,400
Costs Incurred as of September 30, 2013	8,391
Estimated Completion Date	4th Qtr 2013
Property First Choice ER - Brodie | Location Austin, TX | Property Type General Acute Care Hospital | Operator First Choice
Business Acquisition [Line Items]
Original Commitment	5,470
Costs Incurred as of September 30, 2013	1,509
Estimated Completion Date	1st Qtr 2014
Property First Choice ER - Little Elm | Location Dallas, TX [Member] | Property Type General Acute Care Hospital | Operator First Choice
Business Acquisition [Line Items]
Original Commitment	5,200
Costs Incurred as of September 30, 2013	2,792
Estimated Completion Date	4th Qtr 2013
Property Rehabilitation Hospital of the Northwest | Location Post Falls, ID | Property Type Rehabilitation Hospital | Operator Ernest Health, Inc.
Business Acquisition [Line Items]
Original Commitment	14,387
Costs Incurred as of September 30, 2013	10,389
Estimated Completion Date	4th Qtr 2013
Property Oakleaf Surgical Hospital | Location Altoona, WI | Property Type General Acute Care Hospital | Operator National Surgical Hospitals
Business Acquisition [Line Items]
Original Commitment	33,500
Costs Incurred as of September 30, 2013	11,146
Estimated Completion Date	3rd Qtr 2014
Property Northern Utah Rehabilitation Hospital | Location South Ogden, UT | Property Type Rehabilitation Hospital | Operator Ernest Health, Inc.
Business Acquisition [Line Items]
Original Commitment	19,153
Costs Incurred as of September 30, 2013	7,406
Estimated Completion Date	3rd Qtr 2014
Property First Choice Emergency Rooms | Location Various | Property Type General Acute Care Hospital | Operator First Choice
Business Acquisition [Line Items]
Original Commitment	$ 89,330
Estimated Completion Date	Various