Pension and Post-Retirement Benefits - Estimated Future Pension and Post-Retirement Benefit Payments (Detail) $ in Thousands	Dec. 31, 2015 USD ($)
Pension Benefits
Pension Plans, Postretirement and Other Employee Benefits
2015	$ 6,580
2016	6,870
2017	7,079
2018	7,294
2019	7,391
2021-2025	38,190
Post-retirement Benefits \| Before Medicare Subsidy
Pension Plans, Postretirement and Other Employee Benefits
2015	1,505
2016	1,522
2017	1,495
2018	1,542
2019	1,628
2021-2025	8,926
Post-retirement Benefits \| After Medicare Subsidy
Pension Plans, Postretirement and Other Employee Benefits
2015	1,382
2016	1,397
2017	1,369
2018	1,412
2019	1,495
2021-2025	$ 8,226

Pension Plans, Postretirement and Other Employee Benefits [Line Items]

No definition available.

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- Definition

Amount of benefits from a defined benefit plan expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ 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 (f)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

+ Details

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- Definition

Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

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- Definition

Amount of benefits from a defined benefit plan expected to be paid in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

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- Definition

Amount of benefits from a defined benefit plan expected to be paid in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

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- Definition

Amount of benefits from a defined benefit plan expected to be paid in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

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- Definition

Amount of benefits from a defined benefit plan expected to be paid in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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