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Convertible Notes (Interest Expense for the Series 2012 Notes) (Detail) (Series 2012 Notes [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Series 2012 Notes [Member]
Debt Instrument [Line Items]
Contractual coupon interest	$ 1,287	$ 1,263
Amortization of debt issuance costs	284	271
Amortization of debt discount	1,487	1,365
Total	$ 3,058	$ 2,899

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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