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Retirement Benefits - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($) employee | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation for all defined benefit pension plans | $ 150.4 | $ 163.3 |
Percentage of excess gains and losses over benefit obligation or market value of assets amortized | 10.00% |  |
Costs of defined contribution plans | $ 10.3 | 9.1 | $ 8.4
Number of participants covering under multi employer pension plan | employee | 398 |  |
Costs of bargaining unit-sponsored multi-employer plans and defined contribution plans | $ 1.0 | $ 1.0 | $ 1.1
Weighted average annual rate of increase in the per capita cost of covered health care benefits assumed | 6.94% |  |
Assumed decrease of weighted average health care cost trend rate | 4.50% |  |
Year that reaches assumed decrease of weighted average health care cost trend rate | 2027 |  |
Increase in service and interest cost components of the net periodic benefit cost, as 1% increase in health care cost trend rates | $ 0.2 |  |
Increase in accumulated postretirement benefit obligation, as 1% increase in health care cost trend rates | 1.6 |  |
Decrease in service and interest cost components of the net periodic benefit cost, as 1% decrease in health care cost trend rates | 0.1 |  |
Decrease in accumulated postretirement benefit obligation, as 1% decrease in health care cost trend rates | 1.3 |  |
Future estimated benefit payments for year 2016 | 14.2 |  |
Future estimated benefit payments for year 2017 | 10.0 |  |
Future estimated benefit payments for year 2018 | 10.6 |  |
Future estimated benefit payments for year 2019 | 10.3 |  |
Future estimated benefit payments for year 2020 | 10.6 |  |
Future estimated benefit payments for years 2021 to 2025 | 52.6 |  |
Defined Contribution Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan, expected contribution for next fiscal year | 20.8 |  |
401k |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan, expected contribution for next fiscal year | 8.1 |  |
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, expected contribution for next fiscal year | 6.1 |  |
Other Postretirement Benefit Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, expected contribution for next fiscal year | $ 0.9 |  |
Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation of fund assets in equities, minimum | 40.00% |  |
Target allocation of fund assets in equities, maximum | 60.00% |  |
Target allocation of fund assets in equities | 50.00% |  |
Debt Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation of fund assets in equities, minimum | 40.00% |  |
Target allocation of fund assets in equities, maximum | 60.00% |  |
Target allocation of fund assets in equities | 50.00% |  |

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