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Convertible Senior Notes (Parenthetical) (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2014	Jul. 31, 2013
Debt Instrument [Line Items]
Long term debt, principal amount	$ 160,078	$ 156,647
4.25% Convertible Senior Notes (due 2018)
Debt Instrument [Line Items]
Debt instrument, maturity year	2018	2018
Debt instrument, interest rate	4.25%	4.25%		4.25%
Long term debt, principal amount	$ 21,178	$ 21,178		$ 100,000
3.25% Convertible Senior Notes (due 2020)
Debt Instrument [Line Items]
Debt instrument, maturity year	2020	2020
Debt instrument, interest rate	3.25%	3.25%
Long term debt, principal amount	$ 25,900	$ 22,469
4.875% Convertible Senior Notes (due 2020)
Debt Instrument [Line Items]
Debt instrument, maturity year	2020	2020
Debt instrument, interest rate	4.875%	4.875%	4.875%
Long term debt, principal amount	$ 113,000	$ 113,000	$ 115,000

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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