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Pension and Other Post-Retirement Benefits - Additional Information (Detail) | 3 Months Ended
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Mar. 31, 2017 USD ($)
Post-Retirement Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Expected contribution to defined benefit plan for the fiscal year | $ 1,300,000
Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Expected contribution to defined benefit plan for the fiscal year | $ 0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |