Share-Based Compensation Related to Employees and Directors (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Cost of employee share-based compensation included in income (loss), before income tax	$ 7,150,000		$ 11,306,000		$ 13,389,000
Income tax benefit	(96,000)	[1]	(77,000)	[1]	(4,406,000)	[1]
Amount included in net loss	7,054,000		11,229,000		8,983,000
Impact on net loss per common share:
Basic and diluted	$ (0.11)		$ (0.17)		$ (0.14)
Cost of sales
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Cost of employee share-based compensation included in income (loss), before income tax	276,000		424,000		938,000
Operating expenses
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Cost of employee share-based compensation included in income (loss), before income tax	$ 6,874,000		$ 10,882,000		$ 12,451,000

[1] Due to the effects the deferred tax asset valuation allowance, the Company's effective tax rate for 2012 and 2011 is not comparable to the effective tax rate for 2010 as the Company's income tax amount is not directly correlated to the amount of its pre-tax loss in both periods (see Note 12).