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Postretirement Benefit Plans - Defined Benefit Plans - Additional Information (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Feb. 18, 2015 | Feb. 19, 2014
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% |  |  |  |
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 | 6.30% |  |  |  |
U.S Plans [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Percentage of fixed income assets in debt securities | 20.00% |  |  |  |
Common shares sold to the Company's ESOP trust |  |  |  | 39,360 | 37,999
Expected payment related to qualified plan | $ 0 |  |  |  |
Expected payment related to unqualified plan | $ 198,000 |  |  |  |
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 | $ 361,000 |  |  |  |
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 | 8.57% |  |  |  |
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 | 27.00% |  |  |  |
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 | 7.30% |  |  |  |
Real Estate Fund [Member] | U.K Plans [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Percentage of target allocation for investment category | 2.00% |  |  |  |
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 | 9.00% |  |  |  |
Cash [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 | 4.26% |  |  |  |
United States [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated benefit obligation at end of year | $ 160,789,000 |  |  |  |
Expected long-term rate of return on assets | 7.50% | 7.75% | 7.75% |  |
United Kingdom [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Accumulated benefit obligation at end of year | $ 19,950,000 |  |  |  |
Expected long-term rate of return on assets | 4.66% | 5.84% | 5.25% |  |

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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 Defined benefit plan target plan asset percentage of debt securities below investment grade. + 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 For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + 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=58740216&loc=d3e1928-114920 + Details
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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. + Details
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