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 $ in Thousands	Sep. 30, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Cost basis	$ 35,475
Gross unrealized holding gains	206
Gross unrealized holding losses	(827)
Fair value	$ 34,854