Real Estate and Loans Receivable - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended				12 Months Ended		1 Months Ended				12 Months Ended	1 Months Ended	3 Months Ended		1 Months Ended		3 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended			12 Months Ended					12 Months Ended		1 Months Ended		3 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended		12 Months Ended		3 Months Ended		1 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended		1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended	1 Months Ended			1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended	1 Months Ended				12 Months Ended			1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended				1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended				1 Months Ended		12 Months Ended		3 Months Ended			12 Months Ended			1 Months Ended	12 Months Ended
	Mar. 31, 2012	Sep. 30, 2012	Dec. 31, 2012 Y	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2012 Maximum	Dec. 31, 2012 Minimum	Dec. 27, 2012 Huntington	Aug. 21, 2012 Denham Springs LTACH	Jun. 15, 2012 HealthSouth Rehabilitation Hospital of Fayetteville	Dec. 30, 2011 Sherman Oaks Hospital	Dec. 31, 2011 Mountainview Regional Rehabilitation Hospital	Oct. 31, 2010 Sharpstown Facility	Jun. 30, 2010 Acute Care Medical Center	Dec. 31, 2010 Montclair Hospital	Sep. 28, 2012 Thornton	Oct. 22, 2012 New Bedford	Dec. 31, 2012 New Bedford	Nov. 04, 2011 Hoboken, NJ	Dec. 31, 2012 Hoboken, NJ Y	Nov. 04, 2011 Hoboken, NJ Maximum	Dec. 31, 2012 Ernest	Dec. 31, 2012 Prime Health Care Services	Dec. 31, 2012 United States	Dec. 31, 2012 Twelve Oaks Facility	Dec. 31, 2012 Ernest	Feb. 29, 2012 Ernest	Dec. 31, 2012 Ernest Key Management Personnel	Dec. 31, 2012 Ernest Minimum	Dec. 31, 2012 Rehabilitation Hospital	Dec. 14, 2012 Acute Care Facility Y	Sep. 30, 2011 Acute Care Facility Y	Dec. 31, 2009 Acute Care Facility	Dec. 31, 2012 Acute Care Facility Y	Dec. 14, 2012 Acute Care Facility Maximum	Dec. 31, 2012 Bayonne Medical Center Property	Jul. 18, 2011 Vibra Specialty Hospital Y	Dec. 31, 2012 Vibra Specialty Hospital Maximum	Dec. 31, 2012 Vibra Specialty Hospital Minimum	Oct. 14, 2011 Acute Care Hospitals	Dec. 31, 2012 Acute Care Hospitals Y	Dec. 31, 2010 Acute Care Hospitals	Dec. 31, 2012 Acute Care Hospitals Maximum	Dec. 31, 2012 Acute Care Hospitals Minimum	Dec. 31, 2010 Triumph Hospital Clear Lake	Dec. 31, 2010 Triumph Hospital Tomball	Mar. 31, 2012 Florence Facility	Dec. 31, 2012 Emerus Facility Facility which Received a Certificate of Occupancy	Oct. 31, 2012 Emerus Facility Facility which Received a Certificate of Occupancy	Oct. 31, 2012 Emerus Facility Remaining Development Facility One	Dec. 31, 2012 Emerus Facility Remaining Development Facility One	Oct. 31, 2012 Emerus Facility Remaining Development Facility Two	Dec. 31, 2012 Emerus Facility Remaining Development Facility Two	Jul. 03, 2012 Prime Health Care Services	Dec. 31, 2012 Prime Health Care Services	Dec. 31, 2011 Prime Health Care Services	Jul. 03, 2012 Prime Health Care Services Loans, net	Dec. 31, 2011 LTACH Facility	Sep. 04, 2012 Monroe Hospital	Sep. 30, 2010 Monroe Hospital	Dec. 31, 2012 Monroe Hospital D	Dec. 31, 2010 Monroe Hospital	Dec. 31, 2012 Ernest Transaction and Other Acquisitions	Dec. 20, 2012 Acute Care Facilities in Altoona	Dec. 31, 2012 Acute Care Facilities in Altoona	Jan. 31, 2011 Series of Individually Immaterial Business Acquisitions	Sep. 19, 2012 Series of Individually Immaterial Business Acquisitions St. Mary's Regional Medical Center	Sep. 19, 2012 Series of Individually Immaterial Business Acquisitions Roxborough Memorial Hospital	Jan. 04, 2011 Series of Individually Immaterial Business Acquisitions Gilbert Hospital Y	Dec. 31, 2012 Series of Individually Immaterial Business Acquisitions Gilbert Hospital	Jan. 31, 2011 Series of Individually Immaterial Business Acquisitions Atrium Medical Center Y	Dec. 31, 2012 Series of Individually Immaterial Business Acquisitions Atrium Medical Center	Jan. 31, 2011 Series of Individually Immaterial Business Acquisitions Atrium Medical Center Maximum	Jan. 31, 2011 Series of Individually Immaterial Business Acquisitions Atrium Medical Center Minimum	Jan. 31, 2011 Series of Individually Immaterial Business Acquisitions Vibra	Feb. 04, 2011 Series of Individually Immaterial Business Acquisitions Bayonne Medical Center Y	Dec. 31, 2012 Series of Individually Immaterial Business Acquisitions Bayonne Medical Center	Dec. 31, 2012 Series of Individually Immaterial Business Acquisitions Alvarado Hospital	Feb. 09, 2011 Series of Individually Immaterial Business Acquisitions Alvarado Hospital	Feb. 14, 2011 Series of Individually Immaterial Business Acquisitions Northland Ltach Hospital	Dec. 31, 2012 Series of Individually Immaterial Business Acquisitions Northland Ltach Hospital	Jun. 17, 2010 Series of Individually Immaterial Business Acquisitions Inpatient rehabilitation hospital in spartanburg	Dec. 31, 2012 Series of Individually Immaterial Business Acquisitions Inpatient rehabilitation hospital in spartanburg	Dec. 31, 2012 Business Acquisitions	Dec. 31, 2011 Business Acquisitions	Dec. 31, 2010 Business Acquisitions	Jun. 13, 2012 Ernest Rehabilitation Hospital	Dec. 31, 2012 Ernest Rehabilitation Hospital	Oct. 31, 2012 Ernest Inpatient rehabilitation hospital in spartanburg	Dec. 31, 2012 Ernest Inpatient rehabilitation hospital in spartanburg	Dec. 31, 2012 Intangible Assets	Dec. 31, 2011 Intangible Assets	Dec. 31, 2010 Intangible Assets	Sep. 30, 2010 Leasing Operations	Mar. 31, 2010 Leasing Operations	Dec. 31, 2011 Leasing Operations	Dec. 31, 2010 Leasing Operations	Dec. 31, 2010 Leasing Operations Bucks County Facility	Jun. 30, 2011 Leasing Operations Redding Hospital	Jun. 30, 2010 Leasing Operations Redding Hospital	Dec. 31, 2012 Leasing Operations Redding Hospital	Dec. 31, 2011 Leasing Operations Redding Hospital	Dec. 31, 2010 Leasing Operations Redding Hospital	May 04, 2012 Victoria, TX Acute Care Facility	Dec. 31, 2012 Victoria, TX Acute Care Facility
Significant Acquisitions and Disposals [Line Items]
Combined purchase price and investment amount																												$ 396,500,000
Business acquisition cost of acquired entity																				50,000,000								200,000,000				10,500,000	10,000,000					13,000,000			30,000,000		64,000,000																									80,000,000	30,000,000	17,100,000		23,500,000					58,000,000			70,000,000	19,500,000		74,000,000
First mortgage loan																												100,000,000
Acquisition loan made																											93,200,000	93,200,000
Capital contribution																												3,300,000	3,300,000
Number of facilities acquired																															5				7
Number of states																																			7
Aggregate purchase price			200,000,000
Term of lease, years			20																		15											15	15		15			15				15						25																								15					15
Number of lease extension options in current lease contract			3																		6											3			3							3				2	2																								3	2					6					3														3
Term of lease extension, years			5 years																		5 years											5 years			5 years				5 years	3 years		5 years				5 years	5 years																								5 years	10 years					5 years					5 years		10 years												5 years
Percentage of rental rate			9.00%				5.00%	2.00%
Loan secured by mortgage interest			100,000,000
Total investment																											96,500,000
Preferential rate of return on loan amount																											15.00%
Preferential return on remaining earnings																											79.00%
Coupon payable in cash, year one																														6.00%
Coupon payable in cash, year two																														7.00%
Coupon payable in cash in, thereafter																											10.00%
Agreement terms																											Although there are provisions in the loan agreement that are expected to result in full payment of the 15% preference when funds are sufficient. Any of the 15% in excess of the minimum that is not paid may be accrued and paid upon the occurrence of a capital or liquidity event and is payable at maturity. The loan may be prepaid without penalty at any time.
New mortgage loan funded					(43,000,000)																																																					100,000,000
Number of beds at Centinela Hospital Medical Center used to secure loan																																																							369
Number of beds acquired																				350												40	40					40								110	75																					380	140	19		60					278			306	35							40																	26
Payments to acquire equity method investments																																2,000,000	1,400,000					2,500,000																																						1,300,000
Ownership interest in equity			100.00%																	100.00%												25.00%	25.00%					25.00%																													51.00%									19.00%
Working capital loan to the joint venture																						20,000,000										2,000,000	2,000,000																																		5,200,000
Revolving loan																																				2,500,000
Date of properties acquired																																Sep. 30, 2011			Sep. 30, 2011			Jul. 18, 2011																																	Jan. 04, 2011		Jan. 31, 2011					Feb. 04, 2011	Feb. 09, 2011			Feb. 14, 2011		Jun. 17, 2010
Revenue contributed by the acquired entity																																																																																					46,300,000	21,200,000	4,300,000											1,400,000
Income contributed by the acquired entity			113,450,000	81,744,000																																																																																	46,100,000	14,100,000	3,400,000
Acquisition related costs																																																																																					5,400,000	4,200,000	2,000,000
Acquisition-related costs on consummated deals			5,100,000	1,900,000																																																																																	5,100,000	1,900,000	1,100,000
Age of real estate acquired																																																																						4
Lease expiration date																																																																						2022-05		2024-06
Rent escalations percentage																																												3.00%	1.00%																										2.50%			5.00%	1.00%							2.75%
Date of construction																																																																								2009
Retained ownership in operating entity																																																																			49.00%
Number of stories in building																																					6
Lease expiration year																																														2025	2026																																		2028		2033																						2028
Construction completion date																																																																																	2008-04
Existing mortgage loan			368,650,000	165,000,000	165,000,000	200,164,000																	100,000,000	100,000,000																																								93,200,000																		15,000,000
Mortgage loan, maturity date																																																																																		2018-01
Number of leased hospital																																									3
Agreement entry date																																										Oct. 14, 2011
Equity investment																				75,000,000
Working capital loan outstanding																					15,100,000
Purchase of convertible note																				5,000,000
Option to acquire percentage of hospital operator																				25.00%
Number of properties																																		1									2																																								3
Number of leases renewed																																																																																				2
Estimated total development cost																																																			3,700,000		3,100,000												33,500,000																							16,600,000		18,000,000															9,400,000
Estimated total development cost, funded																																																				8,100,000		10,900,000												300,000																							13,300,000																	1.9
Business acquisition agreement																																																																		Dec. 20, 2012																							Jun. 13, 2012		Oct. 01, 2012															May 04, 2012
Expected facility completion date																																																	2013 first quarter																First quarter of 2014																							2013 first quarter.		Third quarter of 2013															Third quarter of 2013
Estimated total development cost, funded																																																																																											3,700,000
Cost of land and building																																																30,000,000		7,600,000
Facility partially occupied date																										Feb. 20, 2013
Percentage of facility partially occupied																										55.00%
Proceeds from sale of real estate		42,000,000	71,202,000	41,130,000	97,669,000				12,500,000	5,200,000	16,000,000	20,000,000	21,100,000	2,700,000	75,000,000	20,000,000																		15,000,000
Gain (loss) on sale of real estate									1,900,000	300,000	(1,400,000)	3,100,000	2,300,000	700,000	6,000,000	2,200,000	8,400,000	7,200,000																300,000
Straight line rent receivables write-off									700,000			1,200,000				1,000,000	1,600,000		4,100,000																																										2,500,000																																		200,000
Number of bed sold															369
Intangible lease assets			52,824,000	51,206,000
Accumulated amortization, net																																																																																												40,500,000	42,500,000
Amortization expense related to intangible lease assets																																																											600,000																																	3,900,000	5,200,000	3,200,000
Capitalized lease intangibles, weighted average life (in years)			14 years 1 month 6 days
Master lease term																																																							10 years
Master lease agreements, number of renewal options																																																							2
Master lease, optional lease term																																																							5 years
Lease escalation percentage																																																							100.00%
Wrote off in related straight-line rent receivables																																																											1,300,000
Gain resulted in exchange of real estate property																																																																																															1,300,000
Rate of increase in annual rent																																																																																																	2.00%
Agreed to settle unpaid rent																																																																																																			3,800,000
Unpaid rent																																																																																																			1,400,000
Charge to unpaid rent																																																																																																			2,400,000
Income expected to be recognized from remaining lease period including previous values																																																																																																						1,200,000	1,200,000	1,200,000
Additional rent received from lease agreement																																																																																																					12,000,000
Income expected to recognize from remaining lease period																																																																																																				7,000,000		5,000,000
Lease advance																																																														29,900,000
Operating leases rent, interest and other charges outstanding																																																														20,100,000
Advanced amount of working capital loan agreement																																																														1,300,000
Interest receivables																																																														5,800,000
Impairment of working capital loan recognized																																																															12,000,000
Number of days past due																																																														90
Net investment to maximum exposure																																																														38,000,000
Impairment of working capital loan estimation-patient receivables considered for first priority secured interest																																																														5,000,000
Impairment of working capital loan estimation-cash balance considered for first priority secured interest																																																														400,000
Management agreement period																																																												4 years
Amount of convertible note converted into equity interest	1,600,000
Convertible note	5,000,000
Percentage of equity shares from convertible debt	9.90%		15.10%
Remaining convertible debt after conversion of part of debt			3,400,000
Percentage of entity revenue from affiliates																											18.60%																													27.30%	30.80%
Percentage of total assets accounted																									24.00%		18.20%																													27.90%	25.30%
Maximum percentage of entity's total assets invested on single property			5.00%
Lease and interest revenue earned from tenants			$ 54,300,000	$ 5,500,000	$ 1,800,000