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Debt - Encore Senior Secured Notes (Detail)
12 Months Ended
Dec. 31, 2016
USD ($)
agreement
Dec. 31, 2011
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]      
Senior Secured Notes, aggregate amount   $ 75,000,000.0  
Senior secured notes $ 11,320,000   $ 28,750,000
Basis spread over the current Treasury Rate (percent) 0.50%    
Number of debt agreements | agreement 2    
2011 Senior Secured Notes [Member]      
Debt Instrument [Line Items]      
Senior Secured Notes, aggregate amount   $ 25,000,000.0  
Debt instrument, interest rate   7.375%  
Senior Secured Notes, periodic principal repayment   $ 1,250,000.00  
Senior secured notes $ 5,100,000    
2010 Senior Secured Notes [Member]      
Debt Instrument [Line Items]      
Senior Secured Notes, aggregate amount   $ 50,000,000.0  
Debt instrument, interest rate   7.75%  
Senior Secured Notes, periodic principal repayment   $ 2,500,000.0  
Senior secured notes $ 6,200,000    
Minimum [Member]      
Debt Instrument [Line Items]      
Debt instrument, interest rate 0.00%