v2.4.0.6
Credit Facility And Long Term Debt (Detail) (USD $)
 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Year
Sep. 30, 2011
Dec. 31, 2011
Debt Disclosure [Line Items]            
Revolving credit facility term (in years)       4    
Proceeds from revolving credit facility       $ 0 $ 30,000,000  
Percentage of equity interest in foreign subsidiaries pledged for revolving credit facility   65.00%        
Total additional finance under long term debt agreements   40,000,000   40,000,000    
Remaining borrowing capacity under long term debt agreements   21,500,000   21,500,000    
Long term debt agreements principal outstanding   9,600,000 16,100,000 9,600,000 16,100,000 14,500,000
Weighted average interest rate on outstanding borrowings   3.60% 3.10% 3.80% 4.20%  
Debt assumed from acquired property 38,600,000     0 38,556,000  
Interest expense   1,300,000 1,600,000 4,000,000 2,500,000  
Minimum [Member]
            
Debt Disclosure [Line Items]            
Commitment fee as percentage of the committed line amount less outstanding borrowings and letters of credit       0.25%    
Maximum [Member]
            
Debt Disclosure [Line Items]            
Commitment fee as percentage of the committed line amount less outstanding borrowings and letters of credit       0.35%    
LIBOR Rate [Member]
            
Debt Disclosure [Line Items]            
Interest rate margin, minimum   1.25%   1.25%    
Interest rate margin, maximum   1.75%   1.75%    
Prime Rate [Member]
            
Debt Disclosure [Line Items]            
Interest rate margin, minimum   0.25%   0.25%    
Interest rate margin, maximum   0.75%   0.75%    
Restricted Cash Balances [Member]
            
Debt Disclosure [Line Items]            
Restricted cash in reserve and cash collateral accounts   5,200,000 4,900,000 5,200,000 4,900,000 5,000,000
Nonrecourse Loan [Member]
            
Debt Disclosure [Line Items]            
Loan maturity date Mar. 01, 2013          
Debt assumed original term (in years) 10          
Balloon payment on loan assumed due at maturity 37,300,000          
Interest rate on assumed loan 6.73%          
Outstanding balance on loan   37,600,000 38,400,000 37,600,000 38,400,000 38,200,000
Line of Credit [Member]
            
Debt Disclosure [Line Items]            
Credit facility maximum borrowing capacity   300,000,000   300,000,000    
Additional increase under credit facility       50,000,000    
Term Loan Facility [Member]
            
Debt Disclosure [Line Items]            
Credit facility maximum borrowing capacity   25,000,000   25,000,000    
Outstanding balance under credit facility   25,000,000   25,000,000    
Interest rate of credit facility   1.70% 1.50% 1.60% 1.50%  
Loan maturity date       Mar. 01, 2015    
Letter of Credit [Member]
            
Debt Disclosure [Line Items]            
Credit facility maximum borrowing capacity   $ 5,000,000   $ 5,000,000