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Pension and Post-Retirement Plans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Pension Benefits |  |  |  |  |
Components of net periodic (credit) expense: |  |  |  |  |
Interest cost | [1] | $ 1,271 | $ 1,404 | $ 2,543 | $ 2,808
Expected return on plan assets | [1] | (4,035) | (4,073) | (8,071) | (8,146)
Amortization of net actuarial loss | [1] | 1,795 | 2,053 | 3,591 | 4,106
Net periodic (credit) expense | [1] | (969) | (616) | (1,937) | (1,232)
Post-Retirement Benefits |  |  |  |  |
Components of net periodic (credit) expense: |  |  |  |  |
Interest cost | [1] | 128 | 144 | 256 | 288
Amortization of prior-service costs | [1] | (62) | (62) | (124) | (124)
Amortization of net actuarial loss | [1] | 76 | 68 | 153 | 136
Net periodic (credit) expense | [1] | $ 142 | $ 150 | $ 285 | $ 300
[1] | Amounts are included in G&A expense on the Consolidated Statements of Income and Comprehensive Income.

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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