RESTRICTED INVESTMENTS AND BOND COLLATERAL - Maturities of Held-to-Maturity Securities (Detail) (Held-to-maturity Securities, USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Held-to-maturity Securities
Schedule of Held-to-maturity Securities [Line Items]
Within one year, Amortized cost	$ 486
Due in five years or less, Amortized cost	1,924
Due after five years to ten years, Amortized cost	854
Due in more than ten years, Amortized cost	548
Maturities of held-to-maturity securities, Amortized cost	3,812
Within one year, Fair Value	490
Due in five years or less, Fair Value	2,029
Due after five years to ten years, Fair Value	1,020
Due in more than ten years, Fair Value	610
Maturities of held-to-maturity securities, Fair Value	$ 4,149