Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Income Taxes [Line Items]
Reconciliation of provision for income taxes on continuing operations at the statutory U.S. Federal tax rate	35.00%
Valuation allowance recognized	$ 233,700,000	$ 175,800,000
Net change in valuation allowance	57,900,000	38,100,000
Valuation allowance relating to state tax credit carryover	400,000
Valuation allowance relating to federal carryover	4,400,000
Net federal operating tax loss carry-forward	1,200,000,000
Net operating tax loss carried forward from stock options	152,900,000
Foreign net operating loss carry forward	15,400,000
Net state operating tax loss carry forward	579,300,000
Undistributed earnings of Company's foreign subsidiaries	$ 4,600,000
Minimum [Member]
Schedule Of Income Taxes [Line Items]
Tax credit carryforward, expiration date	2019
Foreign and state operating tax loss carry forwards expiration date	2013
Maximum [Member]
Schedule Of Income Taxes [Line Items]
Tax credit carryforward, expiration date	2032
Foreign and state operating tax loss carry forwards expiration date	2032