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Convertible Notes (Interest Expense for the May 2015 Notes) (Detail) (May 2015 Notes [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
May 2015 Notes [Member]
Debt Instrument [Line Items]
Contractual coupon interest	$ 1,455	$ 1,455
Amortization of debt issuance costs	304	295
Amortization of debt discount	1,173	1,090
Total	$ 2,932	$ 2,840

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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