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NOTES PAYABLE - Component of Notes Payable (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Short-term Debt [Line Items]
Fair value of medium-term notes	$ 23,342
Callable step-rate notes [Member]
Short-term Debt [Line Items]
Fair value of medium-term notes	15,968
Series A DJIA Protected Notes [Member]
Short-term Debt [Line Items]
Fair value of medium-term notes	$ 7,374

Including the current and noncurrent portions, carrying value at the balance sheet date of a financial instrument used to receive debt funding on a regular basis with original maturities ranging from 5-10 years.

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