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Notes Receivable - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Receivable, Net $ 19.6 $ 21.9
Proceeds from Collection of Loans Receivable 1.0  
Contract receivables 18.4 17.2
Contract Receivable
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Receivables Weighted Average Remaining Amortization Period 4 years  
Provision for uncollectible receivable 0.3 0.6
Contracts Receivable, yield interest at a stated per annum average 16.00%  
Chattel Loans
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans receivable, stated interest yield per annum 7.80%  
Notes Receivable Yield Rate 22.80%  
Receivables Weighted Average Remaining Amortization Period 12 years  
Notes receivable, allowance $ 0.4 $ 0.4