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Note Payable - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Nov. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Stock Repurchased and Retired During Period, Shares	2
Purchase of Treasury Stock	$ 323,035	$ 226,000	$ 1,500,000
Notes Payable	825,000
Debt Instrument, Interest Rate, Stated Percentage	0.24%
Subsequent Event [Member] | March 31 2013 [Member]
Debt Instrument, Periodic Payment, Principal		200,000.00
Subsequent Event [Member] | June 30 2013 [Member]
Debt Instrument, Periodic Payment, Principal		200,000.00
Subsequent Event [Member] | September 30 2013 [Member]
Debt Instrument, Periodic Payment, Principal		200,000.00
Subsequent Event [Member] | December 31 2013 [Member]
Debt Instrument, Periodic Payment, Principal		$ 225,000.00

X

- Definition

Interest rate stated in the contractual debt agreement.

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Amount of the required periodic payments applied to principal.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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The cash outflow to reacquire common stock during the period.

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Number of shares that have been repurchased and retired during the period.

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