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Employee benefit plans - Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Benefit plan adjustments $ (3,883) $ (7,525)  
Net amount recognized 2,524 4,814  
Pension Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Liabilities 1,794 4,163  
Benefit plan adjustments (3,883) (6,252) 1,351
Deferred taxes 1,359 2,091 (459)
Net amount recognized (2,524) (4,161)  
Postretirement Life Insurance Benefits [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Liabilities    3,193  
Benefit plan adjustments (1,273) (1,273) 148
Deferred taxes 620 620 (53)
Net amount recognized    $ (653)