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Schedule of Asset Allocation Policy and Ranges for Overall Risk and Return Objectives of Portfolio (Detail) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Equity Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Assets allocation | 23.00% |
Permitted Range, minimum | 10.00% |
Permitted Range, maximum | 30.00% |
Fixed Income Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Assets allocation | 74.00% |
Permitted Range, minimum | 70.00% |
Permitted Range, maximum | 90.00% |
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Assets allocation | 3.00% | 4.00%
Permitted Range, minimum | 0.00% |
Permitted Range, maximum | 10.00% |

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