XML 103 R88.htm IDEA: XBRL DOCUMENT v3.6.0.2
Pensions and Other Post-retirement Benefits - Components of Net Periodic Benefit Cost (Credit) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 10,417 $ 11,517 $ 9,425
Interest cost 18,752 18,314 19,340
Expected return on plan assets (34,751) (34,130) (32,944)
Amortization of transition amounts 2 2 2
Amortization of prior service (credit) cost (14) 66 84
Recognized net actuarial losses 11,921 15,545 8,639
Settlement loss 5 641 290
Termination benefits 0 0 0
Net periodic benefit cost 6,332 11,955 4,836
Other Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 426 444 538
Interest cost 946 863 1,107
Expected return on plan assets 0 0 0
Amortization of transition amounts 0 0 0
Amortization of prior service (credit) cost (419) (335) (335)
Recognized net actuarial losses 68 27 182
Settlement loss 0 0 0
Termination benefits 0 0 0
Net periodic benefit cost $ 1,021 $ 999 $ 1,492