Retirement Benefit Plans - Weighted Average Asset Allocations and Target Allocations (Detail)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Assets Target Allocations [Line Items]
Plan Assets	100.00%	100.00%
Equity Securities [Member]
Defined Benefit Plan Assets Target Allocations [Line Items]
Plan Assets	50.00%	50.00%
Target Allocation, minimum	30.00%	30.00%
Target Allocation, maximum	60.00%	60.00%
Total Fixed Income [Member]
Defined Benefit Plan Assets Target Allocations [Line Items]
Plan Assets	36.00%	42.00%
Target Allocation, minimum	25.00%	25.00%
Target Allocation, maximum	65.00%	65.00%
Real Assets Fund [Member]
Defined Benefit Plan Assets Target Allocations [Line Items]
Plan Assets	5.00%	6.00%
Target Allocation, minimum	0.00%	0.00%
Target Allocation, maximum	10.00%	10.00%
Cash Equivalents [Member]
Defined Benefit Plan Assets Target Allocations [Line Items]
Plan Assets	9.00%	2.00%
Target Allocation, minimum	0.00%	0.00%
Target Allocation, maximum	5.00%	5.00%

Defined Benefit Plan Assets Target Allocations [Line Items]

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- Definition

Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis.

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)(i)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920

+ Details

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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