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RESTRICTED INVESTMENTS AND BOND COLLATERAL - Carrying Value and Estimated Fair Value of Restricted Investments and Bond Collateral (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Investment [Line Items]
Restricted investments and bond collateral	$ 523,483	$ 69,235
Carrying Value
Investment [Line Items]
Cash and cash equivalents	503,391
Time deposits	2,444
Held-to-maturity securities	34,548
Restricted investments and bond collateral	540,383
Fair Value
Investment [Line Items]
Cash and cash equivalents	503,391
Time deposits	2,444
Held-to-maturity securities	34,707
Restricted investments and bond collateral	$ 540,542

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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