Subsequent Events - Additional Information (Detail) Share data in Thousands, except Per Share data, unless otherwise specified	9 Months Ended			0 Months Ended					0 Months Ended						0 Months Ended				0 Months Ended				9 Months Ended	0 Months Ended
	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Dec. 31, 2013	Sep. 18, 2014 RHM Rehabilitation Facilities [Member] USD ($) Hospital	Sep. 18, 2014 RHM Rehabilitation Facilities [Member] EUR (€)	Sep. 18, 2014 RHM Rehabilitation Facilities [Member] Bad Liebenstein [Member] Bed	Sep. 18, 2014 RHM Rehabilitation Facilities [Member] Bad Tolz [Member] Bed	Sep. 18, 2014 RHM Rehabilitation Facilities [Member] Bad Mergentheim [Member] Bed	Oct. 31, 2014 Subsequent Event [Member] USD ($)	Oct. 25, 2014 Subsequent Event [Member]	Oct. 31, 2014 Subsequent Event [Member] Bed	Oct. 17, 2014 Subsequent Event [Member] USD ($)	Oct. 17, 2014 Subsequent Event [Member] EUR (€)	Oct. 15, 2014 Subsequent Event [Member]	Oct. 25, 2014 Subsequent Event [Member] Minimum [Member]	Oct. 31, 2014 Subsequent Event [Member] Maximum [Member] USD ($)	Oct. 25, 2014 Subsequent Event [Member] Maximum [Member]	Oct. 17, 2014 Subsequent Event [Member] Maximum [Member] USD ($)	Oct. 15, 2014 Subsequent Event [Member] Median [Member] USD ($) Hospital	Oct. 15, 2014 Subsequent Event [Member] Median [Member] EUR (€)	Oct. 15, 2014 Subsequent Event [Member] Median [Member] Hospital	Oct. 15, 2014 Subsequent Event [Member] Waterland [Member]	Sep. 30, 2014 Market Equity Offering Program [Member] USD ($)	Nov. 30, 2014 Market Equity Offering Program [Member] Subsequent Event [Member] USD ($)	Sep. 30, 2014 Market Equity Offering Program [Member] IPO [Member] USD ($)	Nov. 30, 2014 Market Equity Offering Program [Member] IPO [Member] Subsequent Event [Member] USD ($)
Subsequent Event [Line Items]
Aggregate purchase price				$ 81,000,000	€ 63,600,000				$ 32,500,000										$ 900,000,000	€ 705,000,000
Number of rehabilitation hospitals				3	3														38	38
Number of acute care hospitals																					2
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage														5.10%								94.90%
Lease term									15 years	27 years
Effective annual rent escalation, percentage															1.00%		70.00%
Accordion to existing credit facility												250,000,000						400,000,000
Aggregate commited size of credit facility												1,150,000,000	500,000,000					1,550,000,000
One-year senior unsecured term loan																		225,000,000
Number of beds						211	248	271			237
Period for extended lease	Three five-year
Working capital loan									3,000,000							7,500,000
Common stock, shares issued	171,626		161,310																				900	800
Public offering price for common stock per share																									$ 13.21	$ 13.62
Net proceed from issuance of common stock	$ 128,270,000	$ 313,319,000																					$ 12,300,000	$ 10,300,000