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Credit Agreement - Schedule of Credit Agreements (Detail) - Credit Agreement [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | [1]
Credit Agreements: |  |  |
Credit facility remaining availability |  | $ 47,782 | $ 89,930
Outstanding letters of credit | [2],[3] | 2,218 | 5,070
Availability of additional letters of credit | [4] | $ 22,782 | $ 54,930
Weighted average annual interest rate |  | 0.00% | 0.00%
Commitment fee rate |  | 0.30% | 0.25%
Letter of credit fee rate |  | 1.25% | 0.75%
[1] | Amounts listed as of and for the year ended December 31, 2017 relate to our previous credit agreement.
[2] | As of December 31, 2017, $5.1 million of restricted short-term investments provided collateral for our letters of credit.
[3] | As of December 31, 2018 and 2017, outstanding letters of credit not related to the credit agreements totaled $0.3 million and $0.8 million, respectively, which amounts are fully collateralized with restricted cash, which is in addition to the $5.1 million referenced in this Note 11 as of December 31, 2017.
[4] | The letters of credit sublimit of $25.0 million and $60.0 million as of December 31, 2018 and 2017, respectively, under the credit agreements is part of, not in addition to, the $50.0 million and $95.0 million aggregate commitments as of December 31, 2018 and 2017, respectively.

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- Definition Line of credit facility availability for additional letters of credit. + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition The effective interest rate during the reporting period. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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