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Postretirement Benefits Other Than Pensions - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2001
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Minimum age of retirement under option one to avail benefit of post retirement | 55 years |  |  |
Minimum service period served at the time of retirement under option one to avail benefit of post retirement | 15 years |  |  |
Minimum age of retirement under option two to avail benefit of post retirement | 65 years |  |  |
Minimum service period served at time of retirement under option two to avail benefit of post retirement | 10 years |  |  |
Minimum for age plus years of service of retirement under amended plan to avail benefit of post retirement |  |  |  | 60 years
Minimum service period served at the time of retirement under amended plan to avail benefit of post retirement |  |  |  | 10 years
Other Postretirement Benefit Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Discount rate | 3.15% | 3.47% | 3.57% |
Discount rate | 3.47% | 3.57% | 3.32% |
Expected contribution to plan in 2018 | $ 0.3 |  |  |
Net gain (loss) recognized in other comprehensive income | (0.3) |  | $ 2.8 |
Amortization of net loss | 0.2 | $ 0.2 | 0.3 |
Amortization of prior service credit recognized in other comprehensive income | 1.3 | 1.3 | $ 1.3 |
Unrecognized actuarial losses | 3.5 | 3.4 |  |
Unrecognized actuarial losses, net of tax | 1.9 | 2.0 |  |
Unrecognized Prior service credit | 12.4 | 13.7 |  |
Unrecognized Prior service credit, Net of Tax | $ 6.9 | $ 7.8 |  |

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- Definition Minimum retirement age to receive benefits if participant has reached fifteen years of service. + References No definition available. + Details
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- Definition Minimum retirement age to receive benefits if participant has reached ten years of service. + References No definition available. + Details
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- Definition Minimum of age plus years of service for eligibility under the plan when the plan was amended in 2001. + References No definition available. + Details
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- Definition Minimum years of service for eligibility under the plan when the plan was amended in 2001. + References No definition available. + Details
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- Definition Service requirement for a participant to retire at age 55 and receive benefits. + References No definition available. + Details
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- Definition Service requirement for a participant to retire at age 65 and receive benefits. + References No definition available. + Details
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- Definition Amortization of prior service credit recognized in other comprehensive income before tax. + References No definition available. + Details
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- Definition Amortization of net loss recognized in other comprehensive income before tax. + References No definition available. + Details
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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + 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 (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + 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 (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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