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Fair Value Measurements Information of Marketable Securities and Deferred Compensation Fund Investment Assets (Detail) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Municipal bonds	$ 21,398,000	$ 31,337,000
Equity securities - Deferred comp fund	15,795,000	13,780,000
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Municipal bonds	21,398,000	31,337,000
Equity securities - Deferred comp fund	15,795,000	13,780,000
Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities - Deferred comp fund	3,232,000	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	3,232,000	3,029,000
Large-Cap Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities - Deferred comp fund	3,103,000	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	3,103,000	2,716,000
Large-Cap Growth
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities - Deferred comp fund	2,470,000	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	2,470,000	2,184,000
Fixed Income
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities - Deferred comp fund	1,721,000	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	1,721,000	1,429,000
Small Cap Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities - Deferred comp fund	1,329,000	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	1,329,000	1,244,000
Balanced And Lifestyle
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities - Deferred comp fund	1,122,000	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	1,122,000	814,000
Speciality
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities - Deferred comp fund	904,000	832,000
Speciality | Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities - Deferred comp fund	904,000	832,000
International
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities - Deferred comp fund	688,000	562,000
International | Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities - Deferred comp fund	688,000	562,000
Large Cap Blend
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities - Deferred comp fund	771,000	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	771,000	500,000
Mid Cap Growth
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities - Deferred comp fund	328,000	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	328,000	363,000
Small Cap Growth
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities - Deferred comp fund	64,000	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	64,000	53,000
Mid Cap Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities - Deferred comp fund	63,000	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	63,000	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	12,563,000	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	3,103,000	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	2,470,000	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	1,721,000	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	1,329,000	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	1,122,000	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	904,000	832,000
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	688,000	562,000
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	771,000	500,000
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	328,000	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	64,000	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	63,000	54,000
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Municipal bonds	21,398,000	31,337,000
Equity securities - Deferred comp fund	3,232,000	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	$ 3,232,000	$ 3,029,000

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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale which are intended to be held for less than one year or the normal operating cycle, whichever is longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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