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Borrowing Arrangements - Summary of Carrying Amount of Debt and Equity Components (Detail) (USD $)	12 Months Ended			12 Months Ended
	Dec. 31, 2013 2010 Convertible Senior Subordinated Notes [Member]	Dec. 31, 2012 2010 Convertible Senior Subordinated Notes [Member]	Sep. 27, 2010 2010 Convertible Senior Subordinated Notes [Member]	Dec. 31, 2013 2006 Convertible Senior Subordinated Notes [Member]	Dec. 31, 2012 2006 Convertible Senior Subordinated Notes [Member]	May 30, 2006 2006 Convertible Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Principal amount of notes	$ 130,000,000	$ 130,000,000	$ 1,000	$ 750,000	$ 750,000	$ 1,000
Unamortized discount	(5,494,000)	(8,334,000)
Net carrying amount	124,506,000	121,666,000		750,000	750,000
Additional paid-in-capital, net of tax	$ 8,555,000	$ 8,555,000		$ 11,425,000	$ 11,425,000

X

- Definition

Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 25

-Paragraph 22

-URI http://asc.fasb.org/extlink&oid=26072319&loc=SL6014347-161799



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-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 65

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=7667209&loc=SL6052262-162007

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- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section S99

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

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-Paragraph 16

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- Definition

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 20

-Section 50

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- Definition

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399



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