Face (par) amount of debt instrument at time of issuance.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Components of Long Term Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 26, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Principal amount of convertible notes outstanding	$ 557,233		$ 239,097
Less: unamortized discount and fees	(7,122)		(3,164)
Less: current portion	(46,020)		(2,468)
LONG-TERM DEBT	504,091		233,465
Convertible senior notes due 2018 [Member]
Debt Instrument [Line Items]
Long-term Debt, Total	44,561		48,951
Senior notes due 2025 [Member]
Debt Instrument [Line Items]
Principal amount of convertible notes outstanding		$ 325,000
Long-term Debt, Total	325,000		0
Other debt
Debt Instrument [Line Items]
Long-term Debt, Total	93		676
Term loan credit agreement
Debt Instrument [Line Items]
Long-term Debt, Total	$ 187,579		$ 189,470