Real Estate and Lending Activities - Summary of Status Update on Current Development Projects (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Business Acquisition [Line Items]
Original Commitment	$ 194,245
Costs Incurred as of June 30, 2013	31,000
Property Victoria | 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 June 30, 2013	7,937
Estimated Completion Date	3rd Qtr 2013
Property Spartanburg | Location Spartanburg, SC | Property Type Rehabilitation Hospital | Operator Ernest Health, Inc.
Business Acquisition [Line Items]
Original Commitment	17,805
Costs Incurred as of June 30, 2013	12,275
Estimated Completion Date	3rd Qtr 2013
Property Post Falls | Location Post Falls, ID | Property Type Rehabilitation Hospital | Operator Ernest Health, Inc.
Business Acquisition [Line Items]
Original Commitment	14,387
Costs Incurred as of June 30, 2013	4,937
Estimated Completion Date	4th Qtr 2013
Property Oakleaf | 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 June 30, 2013	3,201
Estimated Completion Date	1st 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 June 30, 2013	2,650
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	$ 100,000
Estimated Completion Date	Various