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Postretirement Benefit Plans - Defined Benefit Plans - Additional Information (Detail) - USD ($) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Aug. 08, 2018 | Mar. 09, 2018 | Feb. 21, 2018 | Nov. 20, 2017 | Feb. 21, 2017
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 |  |  |  | 16,833 | 23,471 | 43,930 | 18,827 | 40,837
Expected long-term rate of return on assets | 6.75% | 7.00% | 7.00% |  |  |  |  |
Expected payment related to qualified plan | $ 0 |  |  |  |  |  |  |
Expected payment related to non-qualified plan | $ 301,000 |  |  |  |  |  |  |
U.K Plans [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Expected long-term rate of return on assets | 3.71% | 3.77% | 4.59% |  |  |  |  |
Percentage of premium estimated return for equities and properties to risk free rate | 4.80% |  |  |  |  |  |  |
Percentage of long term return in cash | 4.00% |  |  |  |  |  |  |
Expected payment related to qualified plan | $ 476,000 |  |  |  |  |  |  |
Equities [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Percentage of target allocation for investment category | 59.00% |  |  |  |  |  |  |
Expected long-term rate of return on assets | 6.41% |  |  |  |  |  |  |
Equities [Member] | U.K Plans [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Percentage of target allocation for investment category | 59.00% |  |  |  |  |  |  |
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 | 31.00% |  |  |  |  |  |  |
Employer Securities [Member] | United States [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Percentage of target allocation for investment category | 11.00% |  |  |  |  |  |  |
Insurance Contracts [Member] | U.K Plans [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Percentage of target allocation for investment category | 6.00% |  |  |  |  |  |  |
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 | 1.00% |  |  |  |  |  |  |
U.S. and international equities [Member] |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |
Expected long-term rate of return on assets | 4.79% |  |  |  |  |  |  |

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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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