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Note 18. Income Taxes (Detail) - Federal, State, and Canada Net Operating Loss Carryforwards for Income Tax Purposes (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Federal net operating loss carryforwards	$ 317,745
State net operating loss carryforwards	154,121
Canada [Member]
Canada net operating loss carryforwards	$ 30,656

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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