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Postretirement Benefit Plans - Defined Benefit Plans - Additional Information (Detail) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Nov. 20, 2017 | Feb. 21, 2017 | Feb. 23, 2016
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] |  |  |  |  |  |
Common shares sold to the Company's ESOP trust |  |  |  | 18,827 | 40,837 | 56,894
Expected long-term rate of return on assets | 7.00% | 7.00% | 7.50% |  |  |
Expected payment related to qualified plan | $ 0 |  |  |  |  |
Expected payment related to non-qualified plan | $ 302,000 |  |  |  |  |
U.K Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Expected long-term rate of return on assets | 3.77% | 4.59% | 4.66% |  |  |
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 | $ 461,000 |  |  |  |  |
Equities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Percentage of target allocation for investment category | 50.00% |  |  |  |  |
Expected long-term rate of return on assets | 6.31% |  |  |  |  |
Equities [Member] | U.K Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Percentage of target allocation for investment category | 58.00% |  |  |  |  |
Debt Securities [Member] | United States [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Percentage of target allocation for investment category | 30.00% |  |  |  |  |
Debt Securities [Member] | U.K Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Percentage of target allocation for investment category | 29.00% |  |  |  |  |
Employer Securities [Member] | United States [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Percentage of target allocation for investment category | 20.00% |  |  |  |  |
Insurance Contracts [Member] | U.K Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Percentage of target allocation for investment category | 7.00% |  |  |  |  |
Real Estate Fund [Member] | U.K Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Percentage of target allocation for investment category | 3.00% |  |  |  |  |
Cash [Member] | U.K Plans [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Percentage of target allocation for investment category | 3.00% |  |  |  |  |
U.S. and international equities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Expected long-term rate of return on assets | 4.69% |  |  |  |  |

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- Definition Defined benefit plan number of common shares sold to ESOP trust. + 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 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 Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost 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)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + 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=82843861&loc=d3e1928-114920 + Details
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- Definition Percentage of target 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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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