GENERAL - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended				3 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2014 MortgageLoan Property	Jun. 30, 2014 Property	Jun. 30, 2013	Jun. 30, 2014 Property	Jun. 30, 2013	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013 Litigation Funding Agreement [Member]	Jun. 30, 2014 Stock Options [Member]	Jun. 30, 2013 Stock Options [Member]	Jun. 30, 2014 Finance Leases Financing Receivable [Member]	Jun. 30, 2013 Finance Leases Financing Receivable [Member]	Jun. 30, 2013 Reclassifications [Member]	Jun. 30, 2013 Reclassifications [Member]	Jun. 30, 2014 Level 3 inputs [Member]	Dec. 31, 2012 Level 3 inputs [Member] Fair Value, Measurements, Recurring [Member]	Jun. 30, 2014 Level 3 inputs [Member] Fair Value, Measurements, Nonrecurring [Member]	Dec. 31, 2013 Level 3 inputs [Member] Fair Value, Measurements, Nonrecurring [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Legal settlements received								$ 25,096,000
Accounts receivable measured at fair value																2,972,000
Impaired real estate assets measured at fair value																	2,875,000	9,590,000
Number of real estate properties held for sale				66
Number of properties reclassified		2		2
Impairment charges		2,014,000	468,000	3,677,000	4,452,000						0	0
Assumed holding periods for unobservable inputs															15 years
Assumed annual average rent increases for unobservable inputs															2.00%
Rate of income capitalization for unobservable inputs															8.00%
Cash flows discounted rate for unobservable inputs															7.00%
Outstanding loan amount		475,000		475,000
Number of mortgage loans	1
Allowance for mortgages receivable		133,000		133,000			0
Anti-dilutive securities Excluded from calculation of EPS									5,000	5,000
Cash dividends				15,175,000	10,940,000
Cash dividends per share				$ 0.450	$ 0.325
Payment of regular quarterly cash dividend				13,490,000	13,490,000
Payment of special cash dividend				1,685,000	1,685,000
Regular quarterly cash dividends paid per share				$ 0.40	$ 0.40
Special cash dividends paid per share				$ 0.05	$ 0.05
Rental property expenses		5,992,000	7,049,000	11,883,000	14,440,000								571,000	793,000
Adjustment to decrease in net earnings						$ 420,000