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RESTRICTED INVESTMENTS AND BOND COLLATERAL - Amortized Cost, Gross Unrealized Holding Gains and Losses and Fair Value of Held-to-Maturity Securities (Detail) (Held-to-maturity securities, USD $) In Thousands, unless otherwise specified	Mar. 31, 2014
Held-to-maturity securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized cost	$ 34,548
Gross unrealized holding gains	440
Gross unrealized holding losses	(281)
Fair value	$ 34,707

This item represents investments in debt securities which are categorized as held-to-maturity and that have scheduled maturities more than one year from the balance sheet date or operating cycle, if longer, and that are pledged to one or more secured parties who have the right to buy, sell, or re-pledge the collateral.

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