Reconciliation of Differences from U.S. Federal Statutory Rate (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pretax book income (loss)		$ 48,663	$ 15,213	$ (141,811)
Federal tax expense (benefit) at 35% statutory rate		17,032	5,325	(49,634)
State and local income taxes		2,619	917	(6,981)
Foreign tax rate differential		(14)	0	0
Reversal of income tax valuation allowance against net deferred tax assets	59,887	(59,887)	0	0
(Utilization of) Provisions for valuation allowance for net operating losses and credit carrryforwards - U.S. and states		(19,528)	(6,060)	7,604	0
Effect of non-deductible adjustment to fair market value of warrants		0	0	48,635
Effect of non-deductible stock-based compensation		0	0	395
Other		2,810	(11)	(70)
Total consolidated (benefit) expense		$ (56,968)	$ 171	$ (51)

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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