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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	Dec. 31, 2012
Investment [Line Items]
Total restricted investments and bond collateral	$ 540,383	$ 75,233	$ 87,209
Restricted investments and bond collateral	523,483	69,235	87,209
Carrying Value [Member]
Investment [Line Items]
Cash and cash equivalents	503,391	40,605
Time deposits	2,444	2,444
Held-to-maturity securities	34,548	32,184
Total restricted investments and bond collateral		75,233
Restricted investments and bond collateral	540,383
Fair Value [Member]
Investment [Line Items]
Cash and cash equivalents	503,391	40,605
Time deposits	2,444	2,444
Held-to-maturity securities	34,707	32,046
Total restricted investments and bond collateral		75,095
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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