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Fair Value Measurements - Schedule of Fair Value Information for Financial Assets and Liabilities Carried on Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Financial Liabilities:
Revolving credit facility	$ 8,750	$ 9,750
Total long-term debt	155,675	163,695
Carrying Value [Member]
Financial Liabilities:
Revolving credit facility	8,750	9,750
Total long-term debt	155,627	163,635
Carrying Value [Member] | 4.25% Convertible Senior Notes [Member]
Financial Liabilities:
Total long-term debt	132,901	134,075
Carrying Value [Member] | 3.90% Promissory Note [Member]
Financial Liabilities:
Total long-term debt	9,698
Carrying Value [Member] | 3.75% Callable Promissory Note
Financial Liabilities:
Total long-term debt	7,586	7,837
Carrying Value [Member] | 4.55% Promissory Note [Member]
Financial Liabilities:
Total long-term debt	5,442	5,611
Carrying Value [Member] | 3.95% Promissory Note [Member]
Financial Liabilities:
Total long-term debt		8,875
Carrying Value [Member] | 4% Promissory Note [Member]
Financial Liabilities:
Total long-term debt		7,237
Estimate of Fair Value Measurement [Member]
Financial Liabilities:
Revolving credit facility	8,750	9,750
Total long-term debt	164,847	177,334
Estimate of Fair Value Measurement [Member] | (Level 2) [Member]
Financial Liabilities:
Revolving credit facility	8,750	9,750
Total long-term debt	141,984	147,375
Estimate of Fair Value Measurement [Member] | (Level 3) [Member]
Financial Liabilities:
Total long-term debt	22,863	29,959
Estimate of Fair Value Measurement [Member] | 4.25% Convertible Senior Notes [Member]
Financial Liabilities:
Total long-term debt	141,984	147,375
Estimate of Fair Value Measurement [Member] | 4.25% Convertible Senior Notes [Member] | (Level 2) [Member]
Financial Liabilities:
Total long-term debt	141,984	147,375
Estimate of Fair Value Measurement [Member] | 3.90% Promissory Note [Member]
Financial Liabilities:
Total long-term debt	9,684
Estimate of Fair Value Measurement [Member] | 3.90% Promissory Note [Member] | (Level 3) [Member]
Financial Liabilities:
Total long-term debt	9,684
Estimate of Fair Value Measurement [Member] | 3.75% Callable Promissory Note
Financial Liabilities:
Total long-term debt	7,651	7,861
Estimate of Fair Value Measurement [Member] | 3.75% Callable Promissory Note | (Level 3) [Member]
Financial Liabilities:
Total long-term debt	7,651	7,861
Estimate of Fair Value Measurement [Member] | 4.55% Promissory Note [Member]
Financial Liabilities:
Total long-term debt	5,528	5,802
Estimate of Fair Value Measurement [Member] | 4.55% Promissory Note [Member] | (Level 3) [Member]
Financial Liabilities:
Total long-term debt	$ 5,528	5,802
Estimate of Fair Value Measurement [Member] | 3.95% Promissory Note [Member]
Financial Liabilities:
Total long-term debt		8,887
Estimate of Fair Value Measurement [Member] | 3.95% Promissory Note [Member] | (Level 3) [Member]
Financial Liabilities:
Total long-term debt		8,887
Estimate of Fair Value Measurement [Member] | 4% Promissory Note [Member]
Financial Liabilities:
Total long-term debt		7,409
Estimate of Fair Value Measurement [Member] | 4% Promissory Note [Member] | (Level 3) [Member]
Financial Liabilities:
Total long-term debt		$ 7,409

X

- 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, commercial paper, and finance lease obligations.

+ References

No definition available.

+ Details

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- References

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

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))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

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X

- Definition

Fair value portion of contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time.

+ References

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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