RESTRICTED INVESTMENTS AND BOND COLLATERAL - Amortized Cost, Gross Unrealized Holding Gains and Losses and Fair Value of Held-to-Maturity Securities (Detail) (Restricted Investments and Bond Collateral, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Restricted Investments and Bond Collateral
Schedule of Available-for-sale Securities [Line Items]
Cost basis	$ 34,212
Gross unrealized holding gains	901
Gross unrealized holding losses	(522)
Fair value	$ 34,591