Schedule of Real Estate Investments and Accumulated Depreciation (Detail) (USD $) In Thousands, unless otherwise specified								12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009	Dec. 31, 2012 Covington, LA		Dec. 31, 2012 Redding, CA		Dec. 31, 2012 Bloomington, IN		Dec. 31, 2012 Dallas, TX		Dec. 31, 2012 La Palma, CA		Dec. 31, 2012 Anaheim, CA		Dec. 31, 2012 Luling, TX		Dec. 31, 2012 San Antonio, TX		Dec. 31, 2012 Victoria, TX		Dec. 31, 2012 Houston, TX		Dec. 31, 2012 Bensalem, PA		Dec. 31, 2012 Portland, OR		Dec. 31, 2012 San Diego, CA		Dec. 31, 2012 Redding, CA		Dec. 31, 2012 Houston, TX		Dec. 31, 2012 Bennettsville, SC		Dec. 31, 2012 Bossier City, LA		Dec. 31, 2012 Bristol, CT		Dec. 31, 2012 Cheraw, SC		Dec. 31, 2012 Detroit, MI		Dec. 31, 2012 Enfield, CT		Dec. 31, 2012 Fort Lauderdale, FL		Dec. 31, 2012 Garden Grove, CA		Dec. 31, 2012 Garden Grove, CA		Dec. 31, 2012 Idaho Falls, ID		Dec. 31, 2012 Newington, CT		Dec. 31, 2012 Petersburg, VA		Dec. 31, 2012 West Valley City, UT		Dec. 31, 2012 Poplar Bluff, MO		Dec. 31, 2012 East Providence, RI		Dec. 31, 2012 San Dimas, CA		Dec. 31, 2012 San Dimas, CA		Dec. 31, 2012 West Springfield, MA		Dec. 31, 2012 Tucson, AZ		Dec. 31, 2012 Warwick, RI		Dec. 31, 2012 Webster, TX		Dec. 31, 2012 Wichita, KS		Dec. 31, 2012 Addison, TX		Dec. 31, 2012 Shenandoah, TX		Dec. 31, 2012 Richardson, TX		Dec. 31, 2012 Hill County, TX		Dec. 31, 2012 Webster, TX		Dec. 31, 2012 Tomball, TX		Dec. 31, 2012 Gilbert, AZ		Dec. 31, 2012 Corinth, TX		Dec. 31, 2012 Bayonne, NJ		Dec. 31, 2012 San Diego, CA		Dec. 31, 2012 Northland, MO		Dec. 31, 2012 DeSoto, TX		Dec. 31, 2012 New Braunfels, TX		Dec. 31, 2012 Hoboken, NJ		Dec. 31, 2012 Florence, AZ		Dec. 31, 2012 Hammond, LA		Dec. 31, 2012 San Antonio, TX
Real Estate and Accumulated Depreciation [Line Items]
Type of property								Long term acute care hospital		Long term acute care hospital		Acute care general hospital		Long term acute care hospital		Acute care general hospital		Acute care general hospital		Long term acute care hospital		Rehabilitaion hospital		Long term acute care hospital		Acute care general hospital		Acute care general hospital		Long term acute care hospital		Acute care general hospital		Acute care general hospital		Acute care general hospital		Acute care general hospital		Long term acute care hospital		Wellness Center		Acute care general hospital		Long term acute care hospital		Wellness Center		Rehabilitaion hospital		Acute care general hospital		Medical Office Building		Acute care general hospital		Wellness Center		Rehabilitaion hospital		Acute care general hospital		Acute care general hospital		Wellness Center		Acute care general hospital		Medical Office Building		Wellness Center		Long term acute care hospital		Wellness Center		Long term acute care hospital		Rehabilitaion hospital		Rehabilitaion hospital		Rehabilitaion hospital		Rehabilitaion hospital		Acute care general hospital		Long term acute care hospital		Long term acute care hospital		Acute care general hospital		Long term acute care hospital		Acute care general hospital		Acute care general hospital		Long term acute care hospital		Long term acute care hospital		Long term acute care hospital		Acute care general hospital		Acute care general hospital		Long term acute care hospital		Acute care general hospital
Initial costs, land	$ 107,321							$ 821				$ 2,457		$ 1,000		$ 937		$ 1,875		$ 811				$ 625		$ 4,757		$ 6,911		$ 3,085		$ 6,550		$ 1,555		$ 3,501		$ 794		$ 900		$ 485		$ 657		$ 1,220		$ 384		$ 3,499		$ 5,502		$ 862		$ 1,822		$ 270		$ 1,302		$ 5,516		$ 2,659		$ 209		$ 6,160		$ 1,915		$ 583		$ 920		$ 1,265		$ 988		$ 1,019		$ 2,013		$ 2,033		$ 2,219		$ 1,120		$ 663		$ 1,298		$ 150		$ 1,288		$ 2,003		$ 12,663		$ 834		$ 1,067		$ 1,100		$ 1,387		$ 900		$ 519		$ 2,248
Initial costs, buildings	1,056,202							10,238		19,952		31,209		13,589		10,907		21,814		9,345		10,198		7,197		56,238		38,185		17,859		15,653		53,863		34,530		15,772		17,818		2,267		19,576		8,687		2,257		21,939		10,748		7,888		37,467		1,615		9,121		58,314		38,694		1,265		6,839		5,085		3,185		6,078		759		10,432		18,373		22,531		21,943		17,419		17,882		33,751		23,982		15,553		21,175		51,495		52,431		17,182		10,701		7,883		44,351		28,636		8,941		5,390
Additions subsequent to acquisition, improvements	399																																																																																															313								86
Additions subsequent to acquisition, carrying costs	25,630							14		4,361		408		368		3		10								1,259		(353)		2,559		77		13		12,468										(365)				1		51		28		4,665								1				34		18								1		1																								8
land at cost	110,364	[1]						821	[1]	1,629	[1]	2,576	[1]	1,421	[1]	937	[1]	1,875	[1]	811	[1]			625	[1]	5,464	[1]	6,911	[1]	3,071	[1]	6,550	[1]	1,555	[1]	3,274	[1]	794	[1]	900	[1]	485	[1]	657	[1]	1,220	[1]	384	[1]	3,499	[1]	5,502	[1]	862	[1]	1,822	[1]	270	[1]	1,302	[1]	5,516	[1]	2,660	[1]	209	[1]	6,160	[1]	1,915	[1]	583	[1]	920	[1]	1,265	[1]	988	[1]	1,019	[1]	2,013	[1]	2,033	[1]	2,219	[1]	1,120	[1]	663	[1]	1,298	[1]	150	[1]	1,601	[1]	2,003	[1]	12,663	[1]	834	[1]	1,161	[1]	1,100	[1]	1,387	[1]	900	[1]	519	[1]	2,248	[1]
Buildings at cost	1,079,188	[1]						10,252	[1]	22,684	[1]	31,498	[1]	13,536	[1]	10,910	[1]	21,824	[1]	9,345	[1]	10,198	[1]	7,197	[1]	56,790	[1]	37,832	[1]	20,432	[1]	15,730	[1]	53,876	[1]	47,225	[1]	15,772	[1]	17,818	[1]	2,267	[1]	19,576	[1]	8,322	[1]	2,257	[1]	21,940	[1]	10,799	[1]	7,916	[1]	42,132	[1]	1,615	[1]	9,121	[1]	58,314	[1]	38,694	[1]	1,265	[1]	6,873	[1]	5,103	[1]	3,185	[1]	6,078	[1]	759	[1]	10,433	[1]	18,374	[1]	22,531	[1]	21,943	[1]	17,419	[1]	17,882	[1]	33,751	[1]	23,982	[1]	15,553	[1]	21,175	[1]	51,495	[1]	52,431	[1]	17,182	[1]	10,701	[1]	7,883	[1]	44,351	[1]	28,636	[1]	8,941	[1]	5,390	[1]
Total at cost	1,189,552	[1]	1,191,096	[2]	990,635	[2]	934,601	11,073	[1]	24,313	[1]	34,074	[1]	14,957	[1]	11,847	[1]	23,699	[1]	10,156	[1]	10,198	[1]	7,822	[1]	62,254	[1]	44,743	[1]	23,503	[1]	22,280	[1]	55,431	[1]	50,499	[1]	16,566	[1]	18,718	[1]	2,752	[1]	20,233	[1]	9,542	[1]	2,641	[1]	25,439	[1]	16,301	[1]	8,778	[1]	43,954	[1]	1,885	[1]	10,423	[1]	63,830	[1]	41,354	[1]	1,474	[1]	13,033	[1]	7,018	[1]	3,768	[1]	6,998	[1]	2,024	[1]	11,421	[1]	19,393	[1]	24,544	[1]	23,976	[1]	19,638	[1]	19,002	[1]	34,414	[1]	25,280	[1]	15,703	[1]	22,776	[1]	53,498	[1]	65,094	[1]	18,016	[1]	11,862	[1]	8,983	[1]	45,738	[1]	29,536	[1]	9,460	[1]	7,638	[1]
Accumulated depreciation	$ 114,399		$ 84,466					$ 1,944		$ 4,054		$ 5,012		$ 2,143		$ 1,682		$ 3,364		$ 1,421		$ 1,551		$ 1,095		$ 8,585		$ 5,625		$ 2,842		$ 2,226		$ 7,306		$ 3,680		$ 1,873		$ 2,113		$ 840		$ 2,324		$ 1,037		$ 837		$ 2,565		$ 1,115		$ 810		$ 4,856		$ 601		$ 1,026		$ 6,817		$ 4,523		$ 471		$ 701		$ 522		$ 1,186		$ 722		$ 282		$ 1,239		$ 2,181		$ 1,408		$ 1,371		$ 1,089		$ 2,697		$ 1,688		$ 1,199		$ 778		$ 1,020		$ 4,934		$ 2,512		$ 824		$ 381		$ 246		$ 2,507		$ 524		$ 19		$ 31
Date of construction								1984		1991		2006		2006		1971		1964		2002		1987		1998		2006		2006		1964		1964		1974		1960		1984		1982		1975		1982		1956		1974		1985		1982		1982		2002		1979		2006		1980		1980		1979		1972		1979		1976		1987		1979		1986		1992		2008		2008		2008		1980		2004		2005		2005		2008		1918		1973		2007		2008		2007		1863		2012		2003		2012
Date acquired								Jun. 09, 2005		Jun. 30, 2005		Aug. 08, 2006		Sep. 05, 2006		Nov. 08, 2006		Nov. 08, 2006		Dec. 01, 2006		Dec. 01, 2006		Dec. 01, 2006		Dec. 01, 2006		Mar. 19, 2007		Apr. 18, 2007		May 09, 2007		Aug. 10, 2007		Aug. 10, 2007		Apr. 01, 2008		Apr. 01, 2008		Apr. 22, 2008		Apr. 01, 2008		May 22, 2008		Apr. 22, 2008		Apr. 22, 2008		Nov. 25, 2008		Nov. 25, 2008		Apr. 01, 2008		Apr. 22, 2008		Jul. 01, 2008		Apr. 22, 2008		Apr. 22, 2008		Apr. 22, 2008		Nov. 25, 2008		Nov. 25, 2008		Apr. 22, 2008		Apr. 01, 2008		Apr. 22, 2008		Apr. 01, 2008		Apr. 04, 2008		Jun. 17, 2010		Jun. 17, 2010		Jun. 17, 2010		Sep. 17, 2010		Dec. 21, 2010		Dec. 21, 2010		Jan. 04, 2011		Jan. 31, 2011		Feb. 04, 2011		Feb. 09, 2011		Feb. 14, 2011		Jul. 18, 2011		Sep. 30, 2011		Nov. 04, 2011		Nov. 04, 2010		Dec. 14, 2012		Oct. 14, 2011
Life on which depreci- ation in latest income state- ments is computed (Years)								40 years		40 years		40 years		40 years		40 years		40 years		40 years		40 years		40 years		40 years		40 years		40 years		40 years		40 years		40 years		40 years		40 years		10 years		40 years		40 years		10 years		40 years		40 years		40 years		40 years		10 years		40 years		40 years		40 years		10 years		40 years		40 years		10 years		40 years		10 years		40 years		40 years		40 years		40 years		40 years		40 years		40 years		40 years		40 years		40 years		20 years		40 years		40 years		40 years		40 years		20 years		40 years		40 years		40 years

[1] The aggregate cost for federal income tax purposes is $1,183,464.

[2] Includes real estate cost included in real estate held for sale of $68,148 and $109,173 at December 31, 2011 and 2010, respectively. Excludes intangible lease assets that are included in real estate held for sale of $2,194 and $3,555 for 2011 and 2010, respectively.