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Long-term debt - Schedule of Long-term Debt Consisting of Advances (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument [Line Items]    
Long-term debt $ 36,743 $ 45,397
February 2013 [Member]
   
Debt Instrument [Line Items]    
Long-term debt due 2013-02  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.10%  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate     
Long-term debt    179
February 2013 [Member]
   
Debt Instrument [Line Items]    
Long-term debt due 2013-02  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.49%  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate     
Long-term debt    7,000
March 2013 [Member]
   
Debt Instrument [Line Items]    
Long-term debt due 2013-03  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.74%  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate     
Long-term debt    1,282
August 2014 [Member]
   
Debt Instrument [Line Items]    
Long-term debt due 2014-08  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 2.66%  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate     
Long-term debt 141 348
March 2015 [Member]
   
Debt Instrument [Line Items]    
Long-term debt due 2015-03  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.44%  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate     
Long-term debt 919 1,678
March 2015 [Member]
   
Debt Instrument [Line Items]    
Long-term debt due 2015-03  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.48%  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate     
Long-term debt 197 348
November 2015 [Member]
   
Debt Instrument [Line Items]    
Long-term debt due 2015-11  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 4.67%  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate     
Long-term debt 527   
February 2016 [Member]
   
Debt Instrument [Line Items]    
Long-term debt due 2016-02  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 4.86%  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate     
Long-term debt 301   
February 2016 [Member]
   
Debt Instrument [Line Items]    
Long-term debt due 2016-02  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 4.86%  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate     
Long-term debt 301   
February 2017 [Member]
   
Debt Instrument [Line Items]    
Long-term debt due 2017-02  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 4.99%  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate     
Long-term debt 1,311   
September 2017 [Member]
   
Debt Instrument [Line Items]    
Long-term debt due 2017-09  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 2.36%  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate     
Long-term debt 6,500 6,500
April 2018 [Member]
   
Debt Instrument [Line Items]    
Long-term debt due 2018-04  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.83%  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate     
Long-term debt 480 581
December 2019 [Member]
   
Debt Instrument [Line Items]    
Long-term debt due 2019-12  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate     
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.81%  
Long-term debt 3,000 3,000
December 2019 [Member]
   
Debt Instrument [Line Items]    
Long-term debt due 2019-12  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate     
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.45%  
Long-term debt 6,300 6,300
March 2023 [Member]
   
Debt Instrument [Line Items]    
Long-term debt due 2023-03  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 4.69%  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate     
Long-term debt $ 16,766 $ 18,181