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Pension Plans - Weighted-Average Assumptions Used to Determine Benefit Obligations (Detail)	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Weighted Average Assumptions Used In Calculating Benefit Obligation [Abstract]
Discount rate	3.75%	4.25%
Rate of compensation increase	0.00%	0.00%

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- Definition

Defined benefit assumptions used calculating benefit obligation rate of compensation increase.

+ References

No definition available.

+ Details

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

+ 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 (k)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- References

No definition available.

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