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Employee benefit plans - Components of Net Periodic Benefit Cost (Detail) - Pension Benefits [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Net periodic pension cost:        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 174 169 348 338
Expected return on plan assets (233) (227) (466) (454)
Amortization of prior service cost 0 0 0 0
Amortization of unrecognized net loss 50 23 100 46
Net periodic pension cost $ (9) $ (35) $ (18) $ (70)