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Borrowing Arrangements - Summary of Recognized Interest Expense on 2010 Notes and 2006 Notes (Detail) (Convertible Senior Subordinated Notes [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Convertible Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Contractual coupon interest	$ 1,590	$ 1,590	$ 3,181	$ 3,181
Amortization of discount	764	710	1,500	1,394
Amortization of deferred financing costs	180	180	360	360
Total interest expense	$ 2,534	$ 2,480	$ 5,041	$ 4,935

X

- Definition

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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

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Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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