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Investment in Joint Ventures - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2014
site
Jun. 30, 2013
Jun. 30, 2014
site
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
Arizona
Voyager Investments
site
Jun. 30, 2013
Arizona
Voyager Investments
Dec. 31, 2013
Arizona
Voyager Investments
Jun. 30, 2014
Other Regions
ECHO Financing [Member]
site
Jun. 30, 2013
Other Regions
ECHO Financing [Member]
Dec. 31, 2013
Other Regions
ECHO Financing [Member]
Apr. 19, 2013
Other Regions
ECHO Financing [Member]
Jun. 30, 2014
Other Regions
Meadows Investments
site
Jun. 30, 2013
Other Regions
Meadows Investments
Dec. 31, 2013
Other Regions
Meadows Investments
Jun. 30, 2014
Other Regions
Other Investments
site
Jun. 30, 2013
Other Regions
Other Investments
Dec. 31, 2013
Other Regions
Other Investments
Jun. 30, 2014
Florida
Lakeshore Investments
site
Jun. 30, 2013
Florida
Lakeshore Investments
Dec. 31, 2013
Florida
Lakeshore Investments
Jun. 30, 2014
Servicing Assets
Voyager Investments
Jun. 30, 2014
Recreational Vehicle Resort [Member]
Voyager Investments
Schedule of Equity Method Investments [Line Items]                                              
Equity income from unconsolidated joint ventures $ 644,000 $ 609,000 $ 2,531,000 $ 1,185,000   $ 700,000 $ 699,000   $ 18,000 $ 0     $ 600,000 $ 532,000   $ 0 $ (187,000)   $ 1,213,000 $ 141,000      
Adjustment Depreciation     500,000 500,000                                      
Distributions from Unconsolidated Joint Ventures, net     1,800,000                                        
Proceeds from Equity Method Investment, Dividends or Distributions     1,669,000 1,099,000                                      
Unconsolidated Joint Venture Distribution in Excess of Basis 1,100,000                                            
Number Of Joint Venture Sites 3,075   3,075     1,706     0       1,027     0     342        
Equity Method Investment, Ownership Percentage           50.00%     50.00%       50.00%     20.00%     65.00%     33.00% 50.00%
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures $ 14,709,000   $ 14,709,000   $ 11,583,000 $ 7,383,000   $ 7,074,000 $ 5,189,000   $ 2,685,000 $ 1,000,000 $ 2,129,000   $ 1,679,000 $ 0   $ 0 $ 8,000   $ 145,000