Defined benefit plan number of common shares sold to ESOP trust.

No definition available.

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- Definition

Preceding year asset gain or loss considered to calculate expected return on plan assets.

+ References

No definition available.

+ Details

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- Definition

Defined benefit plan percentage of preceding year asset gain or loss considered to calculate expected return on plan assets.

+ References

No definition available.

+ Details

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- Definition

Defined benefit plan percentage of second preceding year asset gain or loss considered to calculate expected return on plan assets.

+ References

No definition available.

+ Details

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- Definition

Preceding year asset gain or loss considered to calculate expected return on plan assets.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Percentage of expected long term rate of return on plan assets.

+ References

No definition available.

+ Details

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- Definition

Percentage of long term return in cash.

+ References

No definition available.

+ Details

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- Definition

Percentage of premium estimated return for equities and properties to risk free rate.

+ References

No definition available.

+ Details

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Expected Long-Term Rate of Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512046

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Target allocation 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=65897934&loc=d3e2446-114920

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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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

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Postretirement Benefit Plans - Defined Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Feb. 23, 2016	Feb. 18, 2015
Defined Benefit Plan Disclosure [Line Items]
Assets gains or losses added for prior year	80.00%
Assets gains or losses added for second preceding year	60.00%
Assets gains or losses added for third preceding year	40.00%
Assets gains or losses added for fourth preceding year	20.00%
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on assets	7.00%	7.50%	7.75%
Commodities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	2.00%
Expected long-term rate of return on assets	2.20%
U.S Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Common shares sold to the Company's ESOP trust				56,894	39,360
Expected payment related to qualified plan	$ 0
Expected payment related to unqualified plan	$ 166,000
U.K Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of premium estimated return for equities and properties to risk free rate	3.00%
Percentage of long term return in cash	4.00%
Expected payment related to qualified plan	$ 300,000
Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	34.00%
Expected long-term rate of return on assets	7.32%
Equities [Member] \| U.K Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	58.00%
Debt Securities [Member] \| U.S Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	35.00%
Debt Securities [Member] \| U.K Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	30.00%
Real Estate Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	4.00%
Expected long-term rate of return on assets	4.80%
Real Estate Fund [Member] \| U.K Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	3.00%
Employer Securities [Member] \| U.S Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	25.00%
Insurance Contracts [Member] \| U.K Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	8.00%
Cash [Member] \| U.K Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	1.00%
U.S. and international equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on assets	4.62%