XML 72 R60.htm IDEA: XBRL DOCUMENT v3.20.2
Employee benefit plans - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Net periodic pension benefit:        
Labor and Related Expense $ 7,048 $ 8,037 $ 14,904 $ 15,632
Pension Benefits        
Net periodic pension benefit:        
Labor and Related Expense 353 415 660 755
Interest cost 163 192 217 320
Expected return on plan assets (371) (325) (494) (542)
Amortization of unrecognized net gain 65 68 87 113
Net periodic benefit $ (143) $ (65) $ (190) $ (109)