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Pension Benefits - Components of Net Periodic Pension Cost Relating to Benefit Plans (Detail) (Net period pension cost [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Net period pension cost [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 8,800us-gaap_DefinedBenefitPlanServiceCost / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember | $ 9,768us-gaap_DefinedBenefitPlanServiceCost / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember | $ 9,921us-gaap_DefinedBenefitPlanServiceCost / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember
Interest cost | 4,975us-gaap_DefinedBenefitPlanInterestCost / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember | 4,974us-gaap_DefinedBenefitPlanInterestCost / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember | 4,392us-gaap_DefinedBenefitPlanInterestCost / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember
Expected return on plan assets | (5,333)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember | (5,688)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember | (5,270)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember
Amortization of net actuarial loss | 7,148us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember | 1,484us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember | 1,980us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember
Plan settlement | (3,332)us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember | 973us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1 / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember |
Other | 557us-gaap_DefinedBenefitPlanOtherCosts / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember | 425us-gaap_DefinedBenefitPlanOtherCosts / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember | 577us-gaap_DefinedBenefitPlanOtherCosts / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember
Net cost | $ 12,815us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember | $ 11,936us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember | $ 11,600us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_RegulatoryLiabilityAxis = us-gaap_PensionCostsMember

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- Definition The amount of gains or losses recognized in net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512136 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of other defined benefit plan costs. + References No definition available. + Details
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- Definition Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Service Cost (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6525008 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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