RESTRICTED INVESTMENTS AND BOND COLLATERAL - Cost Basis, Gross Unrealized Holding Gains and Fair Value of Available-for-Sale Securities (Detail) - Restricted Investments and Bond Collateral [Member] - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Cost basis	$ 36,715	$ 33,879
Gross unrealized holding gains	167	761
Gross unrealized holding losses	(1,069)	(583)
Fair value	$ 35,813	$ 34,057