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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	Dec. 31, 2014	Dec. 31, 2013
Investment [Line Items]
Total restricted investments and bond collateral	$ 164,389us-gaap_RestrictedCashAndInvestments	$ 75,233us-gaap_RestrictedCashAndInvestments
Carrying Value [Member]
Investment [Line Items]
Cash and cash equivalents	127,881
Time deposits	2,451
Available-for-sale	34,057
Total restricted investments and bond collateral	164,389
Fair Value [Member]
Investment [Line Items]
Cash and cash equivalents	127,881
Time deposits	2,451
Available-for-sale	34,057
Total restricted investments and bond collateral	$ 164,389

Investments in debt and equity securities which are categorized neither as trading securities nor held-to-maturity securities, which are intended be sold or mature greater than one year from the balance sheet date or the normal operating cycle, whichever is 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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