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Debt (Parenthetical) (Detail)
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Secured Promissory Notes [Member]
   
Line of Credit Facility [Line Items]    
Average interest rate 2.85% 4.34%
Other Indebtedness [Member]
   
Line of Credit Facility [Line Items]    
Variable and fixed interest rates ranging, minimum 5.00%  
Variable and fixed interest rates ranging, maximum   8.00%
Term Loan Facility [Member] | Senior Secured Credit Facility [Member]
   
Line of Credit Facility [Line Items]    
Average interest rate 4.22% 6.50%
Revolving Credit Facility [Member] | Senior Secured Credit Facility [Member]
   
Line of Credit Facility [Line Items]    
Average interest rate 6.25%