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Pension and Other Post-Retirement Benefits - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2016 USD ($)
Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to defined benefit plan	$ 1,300,000
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to defined benefit plan	$ 0

X

- 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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- 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

X

- Details

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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: