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Pensions and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 2,904 $ 2,481 $ 5,808 $ 4,962
Interest cost 4,593 4,891 9,186 9,782
Expected return on plan assets (8,537) (8,251) (17,074) (16,502)
Amortization of prior service cost 17 21 34 42
Recognized net actuarial losses 4,083 2,203 8,012 4,406
Settlements 33 57 66 114
Net periodic benefit cost 3,093 1,402 6,032 2,804
Other Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 111 156 222 312
Interest cost 216 299 432 598
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (84) (84) (168) (168)
Recognized net actuarial losses 7 83 14 166
Settlements 0 0 0 0
Net periodic benefit cost $ 250 $ 454 $ 500 $ 908