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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Significant Accounting Policies [Line Items]      
Restricted cash and cash equivalents $ 1,160,000 $ 1,255,000  
Carrying value of capitalized software 1,797,000 2,176,000  
Capitalized software amortization 1,320,000 1,493,000 1,206,000
Contractual Period Of Sale Contracts 5 years    
Property and Equipment [Member]
     
Significant Accounting Policies [Line Items]      
Depreciation expense of property and equipment $ 962,000 $ 893,000 $ 890,000
Maximum [Member]
     
Significant Accounting Policies [Line Items]      
Useful life range 7 years    
Amortization of Acquisition Cost 10 years    
Reimbursement range on water, sewer and other infrastructure-related assets 100.00%    
Capitalize reforestation costs 2 years    
Minimum [Member]
     
Significant Accounting Policies [Line Items]      
Useful life range 3 years    
Reimbursement range on water, sewer and other infrastructure-related assets 70.00%