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Note Payable - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified	0 Months Ended	9 Months Ended
	Nov. 30, 2012	Sep. 30, 2013 March 28 2013 [Member]	Sep. 30, 2013 June 27 2013 [Member]	Sep. 30, 2013 September 27, 2013 [Member]	Sep. 30, 2013 December 31 2013 [Member]
Stock Repurchased and Retired During Period, Shares	2
Payments for Repurchase of Common Stock	$ 323,035
Notes Payable	825,000
Debt Instrument, Interest Rate, Stated Percentage	0.24%
Debt Instrument, Periodic Payment		200,488	200,374	200,257
Debt Instrument, Periodic Payment, Principal		200,000	200,000	200,000	225,000
Debt Instrument, Periodic Payment, Interest		$ 488	$ 374	$ 257

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of the required periodic payments including both interest and principal payments.

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Amount of the required periodic payments applied to interest.

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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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