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DISCLOSURES REGARDING FAIR VALUES OF FINANCIAL INSTRUMENTS - Securities in Unrealized Loss Position (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Continuous unrealized loss position, fair value [Abstract]    
One year or greater $ 24,903 $ 29,760
Less than one year 3,198,273 751,645
Continuous unrealized loss position, Fair Value, Total 3,223,176 781,405
Continuous unrealized loss position, aggregate loss [Abstract]    
One year or greater 207 120
Less than one year 21,471 1,843
Unrealized Losses, Total $ 21,678 $ 1,963