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Schedule of Market Values of Pension Plan Assets (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 106,469 | $ 104,074 | $ 87,940
Equity Securities | U.S. Large Cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 8,600 | 22,800 |
Equity Securities | U.S. Mid Cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2,740 | 1,566 |
Equity Securities | U.S. Small-Mid Cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 7,738 |
Equity Securities | U.S. Small Cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2,725 | 1,583 |
Equity Securities | International Developed |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 6,508 | 10,779 |
Equity Securities | Emerging Markets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 4,154 | 3,912 |
Fixed Income Securities | Core Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 23,222 |  |
Fixed Income Securities | Long Duration Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 55,933 | 51,355 |
Fixed income securities | REIT Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2,124 | 3,904 |
Cash | Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 463 | 437 |
Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 106,469 | 104,074 |
Fair Value, Inputs, Level 2 | Equity Securities | U.S. Large Cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 8,600 | 22,800 |
Fair Value, Inputs, Level 2 | Equity Securities | U.S. Mid Cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2,740 | 1,566 |
Fair Value, Inputs, Level 2 | Equity Securities | U.S. Small-Mid Cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 7,738 |
Fair Value, Inputs, Level 2 | Equity Securities | U.S. Small Cap |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2,725 | 1,583 |
Fair Value, Inputs, Level 2 | Equity Securities | International Developed |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 6,508 | 10,779 |
Fair Value, Inputs, Level 2 | Equity Securities | Emerging Markets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 4,154 | 3,912 |
Fair Value, Inputs, Level 2 | Fixed Income Securities | Core Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 23,222 |  |
Fair Value, Inputs, Level 2 | Fixed Income Securities | Long Duration Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 55,933 | 51,355 |
Fair Value, Inputs, Level 2 | Fixed income securities | REIT Fund |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 2,124 | 3,904 |
Fair Value, Inputs, Level 2 | Cash | Cash Equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 463 | $ 437 |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + 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 (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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