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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