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Employee Benefit Plans - Summary of Weighted-Average Assets Allocation (Detail) - Pension Plan [Member]	Dec. 31, 2017
Weighted-Average Assets Allocation
Weighted-Average Assets Allocation	100.00%
Fixed Income [Member]
Weighted-Average Assets Allocation
Weighted-Average Assets Allocation	65.40%
Cash [Member]
Weighted-Average Assets Allocation
Weighted-Average Assets Allocation	34.60%

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- References

No definition available.

+ Details

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- Definition

Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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