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Fair Values of Pension Plan Assets (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Maximum percentage of net assets invested in emerging market | 30.00% |
Equity Hedge Based Funds |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Percentage of net assets invested in funds | 22.00% | 20.00%
Tactical/Directional Based Funds |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Percentage of net assets invested in funds | 30.00% | 27.00%
Relative Value Based Funds |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Percentage of net assets invested in funds | 25.00% | 29.00%
Event Driven Strategy |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Percentage of net assets invested in funds | 17.00% | 17.00%
Cash |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Percentage of net assets invested in funds | 6.00% | 7.00%
Foreign Companies |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Percentage of net assets invested in foreign equity securities | 80.00% |
High Yield Fixed Income |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Percentage of net assets invested | 80.00% |
Fixed Income Securities |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Percentage of net assets invested | 80.00% |
U.S. Russell 2500 Index | Large Companies |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Percentage of net assets invested | 80.00% |
U.S. Russell 2500 Index | Small And Mid-Sized Companies | Equity Securities |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |
Percentage of net assets invested | 80.00% |

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- Details
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