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Postretirement Benefit Plans - Defined Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Feb. 21, 2020	Feb. 21, 2019	Aug. 08, 2018	Mar. 09, 2018	Feb. 21, 2018
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				31,706	32,299	16,833	23,471	43,930
Expected long-term rate of return on assets	6.75%	6.75%	6.75%
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	2.30%	3.82%	3.71%
Percentage of premium estimated return for equities and properties to risk free rate	3.70%
Percentage of long term return in cash	0.10%
Expected payment related to qualified plan	$ 477,000
Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	45.00%
Expected long-term rate of return on assets	7.93%
Equities [Member] | U.K Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	13.00%
Debt Securities [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	38.00%
Debt Securities [Member] | U.K Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	74.00%
Employer Securities [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	15.00%
Cash [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	2.00%
Cash [Member] | U.K Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	9.00%
Insurance Contracts [Member] | U.K Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	4.00%
U.S. and international equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on assets	4.45%

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- Definition

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

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- Definition

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

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

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

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

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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.

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

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Percentage of long term return in cash.

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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
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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.

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Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

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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.

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