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Fair Value Measurements Information of Marketable Securities and Deferred Compensation Fund Investment Assets (Detail) (USD $) | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Municipal bonds | $ 21,354,000 | $ 31,337,000
Equity securities - Deferred comp fund | 17,113,000 | 13,780,000
Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Municipal bonds | 21,354,000 | 31,337,000
Equity securities - Deferred comp fund | 17,113,000 | 13,780,000
Money Market Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 3,456,000 | 3,029,000
Money Market Funds | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 3,456,000 | 3,029,000
Large-Cap Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 3,344,000 | 2,716,000
Large-Cap Value | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 3,344,000 | 2,716,000
Large-Cap Growth |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 2,682,000 | 2,184,000
Large-Cap Growth | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 2,682,000 | 2,184,000
Fixed Income |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 1,903,000 | 1,429,000
Fixed Income | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 1,903,000 | 1,429,000
Small Cap Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 1,484,000 | 1,244,000
Small Cap Value | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 1,484,000 | 1,244,000
Balanced And Lifestyle |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 1,223,000 | 814,000
Balanced And Lifestyle | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 1,223,000 | 814,000
Speciality |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 947,000 | 832,000
Speciality | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 947,000 | 832,000
Large Cap Blend |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 843,000 | 500,000
Large Cap Blend | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 843,000 | 500,000
International |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 735,000 | 562,000
International | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 735,000 | 562,000
Mid Cap Growth |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 358,000 | 363,000
Mid Cap Growth | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 358,000 | 363,000
Small Cap Growth |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 70,000 | 53,000
Small Cap Growth | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 70,000 | 53,000
Mid Cap Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 68,000 | 54,000
Mid Cap Value | Carrying Amount |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 68,000 | 54,000
Quoted Prices In Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 13,657,000 | 10,751,000
Quoted Prices In Active Markets (Level 1) | Large-Cap Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 3,344,000 | 2,716,000
Quoted Prices In Active Markets (Level 1) | Large-Cap Growth |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 2,682,000 | 2,184,000
Quoted Prices In Active Markets (Level 1) | Fixed Income |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 1,903,000 | 1,429,000
Quoted Prices In Active Markets (Level 1) | Small Cap Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 1,484,000 | 1,244,000
Quoted Prices In Active Markets (Level 1) | Balanced And Lifestyle |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 1,223,000 | 814,000
Quoted Prices In Active Markets (Level 1) | Speciality |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 947,000 | 832,000
Quoted Prices In Active Markets (Level 1) | Large Cap Blend |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 843,000 | 500,000
Quoted Prices In Active Markets (Level 1) | International |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 735,000 | 562,000
Quoted Prices In Active Markets (Level 1) | Mid Cap Growth |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 358,000 | 363,000
Quoted Prices In Active Markets (Level 1) | Small Cap Growth |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 70,000 | 53,000
Quoted Prices In Active Markets (Level 1) | Mid Cap Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | 68,000 | 54,000
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Municipal bonds | 21,354,000 | 31,337,000
Equity securities - Deferred comp fund | 3,456,000 | 3,029,000
Significant Other Observable Inputs (Level 2) | Money Market Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities - Deferred comp fund | $ 3,456,000 | $ 3,029,000

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