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Notes Payable and Revolving Credit Agreement - Additional Information (Detail) (USD $)	9 Months Ended			9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Mar. 18, 2009	Sep. 30, 2013 Minimum [Member]	Sep. 30, 2013 Maximum [Member]	Sep. 30, 2013 Revolving credit agreement average effective interest rate of 3.0% inclusive of unused fee [Member]	Jul. 14, 2011 Revolving credit agreement average effective interest rate of 3.0% inclusive of unused fee [Member]	Jun. 04, 2008 Revolving credit agreement average effective interest rate of 3.0% inclusive of unused fee [Member]	Aug. 27, 2007 Revolving credit agreement average effective interest rate of 3.0% inclusive of unused fee [Member]
Proforma Debt Instrument [Line Items]
Revolving credit facility commitment							$ 75,000,000	$ 50,000,000	$ 30,000,000
Purchase of common stock under credit agreement			15,000,000
Company's consolidated leverage ratio	Less than 1.0 to 1.0
Retirement period of stock repurchased	7 days
Maturity start date	Aug. 31, 2011
Maturity end date	Aug. 31, 2015
Spread on Libor variable rate				1.60%	2.50%
Spread on base variable rate				0.10%	1.00%
Special Dividend	$ 0.40
Percentage of unused commitment fee				0.10%	0.25%
Revolving credit outstanding	15,125,000	18,034,000				14,150,000
Remaining revolving credit outstanding						$ 60,850,000

X

- Definition

Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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Earliest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Leverage Ratios

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