Retirement Benefit Plans - Expected Future Plan Benefit Payments (Detail) $ in Thousands	Dec. 31, 2015 USD ($)
Schedule of Expected Future Pension Benefit Payment [Line Items]
2016	$ 20,315
2017	21,281
2018	22,218
2019	23,040
2020	24,015
2021-2025	135,967
Total	246,836
Pension Benefits [Member]
Schedule of Expected Future Pension Benefit Payment [Line Items]
2016	18,997
2017	19,992
2018	20,942
2019	21,750
2020	22,764
2021-2025	129,722
Total	234,167
Other Post-retirement Benefits [Member]
Schedule of Expected Future Pension Benefit Payment [Line Items]
2016	1,318
2017	1,289
2018	1,276
2019	1,290
2020	1,251
2021-2025	6,245
Total	$ 12,669

Defined benefit plan expected future benefit payments.

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- Definition

Schedule of Expected Future Pension Benefit Payment [Line Items]

+ References

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

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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.

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+ 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.

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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.

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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.

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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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