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Retirement Plans - Defined Benefit Plans - Pension Plan's Asset Allocation (Detail) (USD $)
In Millions, unless otherwise specified
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12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| United States Pension Plan of US Entity | Other securities |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Targeted Allocation |
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60.00% |
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| United States Pension Plan of US Entity | Fixed income funds |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Allocation |
44.00% |
48.00% |
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| United States Pension Plan of US Entity | Other funds |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Allocation |
11.00% |
10.00% |
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| United States Pension Plan of US Entity | Equity securities |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Targeted Allocation |
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40.00% |
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| United States Pension Plan of US Entity | Domestic equity funds - large cap |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Allocation |
27.00% |
24.00% |
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| United States Pension Plan of US Entity | Domestic equity funds - small cap |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Allocation |
12.00% |
12.00% |
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| United States Pension Plan of US Entity | International equity funds |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Allocation |
6.00% |
6.00% |
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| Minimum | United States Pension Plan of US Entity | Other securities |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Targeted Allocation |
55.00% |
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| Minimum | United States Pension Plan of US Entity | Equity securities |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Targeted Allocation |
40.00% |
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| Maximum | United States Pension Plan of US Entity | Other securities |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Targeted Allocation |
60.00% |
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| Maximum | United States Pension Plan of US Entity | Equity securities |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Targeted Allocation |
45.00% |
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| Defined Contribution Pension Plan 401 k [Member] |
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| Defined Benefit Plan Disclosure [Line Items] |
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| Employer matching contribution |
$ 6.7 |
$ 6.7 |
$ 7.2 |