Retirement Plans - Expected Benefit Payments to Participants and Estimated Contributions to be Made by Company (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($)
Compensation and Retirement Disclosure [Abstract]
Expected Benefit Payments to Participants, 2017	$ 1,067
Expected Benefit Payments to Participants, 2018	958
Expected Benefit Payments to Participants, 2019	823
Expected Benefit Payments to Participants, 2020	701
Expected Benefit Payments to Participants, 2021	520
Expected Benefit Payments to Participants, 2022-2026	3,212
Estimated Company Contributions, 2017	1,067
Estimated Company Contributions, 2018	958
Estimated Company Contributions, 2019	823
Estimated Company Contributions, 2020	701
Estimated Company Contributions, 2021	520
Estimated Company Contributions, 2022-2026	$ 3,212

Defined benefit plan estimated future employer contributions five fiscal years thereafter.

No definition available.

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- Definition

Defined benefit plan estimated future employer contributions in year five.

+ References

No definition available.

+ Details

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- Definition

Defined benefit plan estimated future employer contributions in year four.

+ References

No definition available.

+ Details

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- Definition

Defined benefit plan estimated future employer contributions in year three.

+ References

No definition available.

+ Details

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- Definition

Defined benefit plan estimated future employer contributions in year two.

+ References

No definition available.

+ Details

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- 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=65897934&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.

+ 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

+ Details

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- Definition

Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

+ Details

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