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Retirement Plans and Other Post-Retirement Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation for all defined benefit pension plans | $ 471.1 | $ 507.4 |
Pension settlement charge |  |  | 2.0
Manager's benchmarked performance minimum | 40.00% |  |
Treasury bills days | 90 days |  |
Defined contribution plans Employees contribution | 50.00% |  |
Expense associated with Defined Contribution Plans | 1.9 | 1.7 | 1.3
Pension Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rates | 5.20% | 4.28% |
Pension settlement charge |  |  | 2.0
Prior service cost as a component of net periodic benefit cost from accumulated other comprehensive income (loss) | 2.9 |  |
Actuarial net (gain) loss as a component of net periodic benefit cost from accumulated other comprehensive income (loss) | 0.3 |  |
Pension Benefits [Member] | Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rates | 3.60% |  |
Pension Benefits [Member] | Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rates | 5.36% |  |
Other Benefits [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rates | 4.52% | 3.58% |
Prior service cost as a component of net periodic benefit cost from accumulated other comprehensive income (loss) | 11.9 |  |
Actuarial net (gain) loss as a component of net periodic benefit cost from accumulated other comprehensive income (loss) | $ 0.5 |  |
Other Benefits [Member] | Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rates | 3.95% |  |
Other Benefits [Member] | Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Discount rates | 4.64% |  |

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- Definition Number of days of treasury bills with which comparison of target return on cash and cash equivalents had done. + References No definition available. + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=32704760&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2417-114920 + Details
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