Fair Value of Financial Instruments - Schedule of Estimated Fair Values of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Less: unamortized discount	$ (150)
Net liabilities carrying amount	5,318
Net liabilities fair value disclosure	5,345
Notes Payable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial instrument carrying amount	2,705
Debt instrument, fair value disclosure	2,660
Zero Coupon Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial instrument carrying amount	230
Debt instrument, fair value disclosure	224
Debentures [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial instrument carrying amount	537
Debt instrument, fair value disclosure	479
Senior Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial instrument carrying amount	1,771
Debt instrument, fair value disclosure	1,761
Long Term Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial instrument carrying amount	225
Debt instrument, fair value disclosure	$ 221