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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, 2017 | Dec. 31, 2016
Credit Agreement: |  |  |
Credit facility remaining availability |  | $ 89,930 | $ 86,403
Outstanding letters of credit | [1],[2] | 5,070 | 8,597
Availability of additional letters of credit | [3] | $ 54,930 | 51,403
Weighted average daily revolving credit borrowings for the year ended |  |  | $ 19
Weighted average annual interest rate |  | 0.00% | 1.93%
Commitment fee rate |  | 0.25% | 0.25%
Letter of credit fee rate | [4] | 0.75% | 0.75%
[1] | As of December 31, 2017 and 2016, outstanding letters of credit not related to the Credit Agreement totaled $0.8 million and $1.4 million, respectively, which amount is fully collateralized with restricted cash, which is in addition to the $5.1 million and $8.6 million, respectively, referenced in this Note 10.
[2] | Represents letters of credit which are fully collateralized with $5.1 million and $8.6 million of restricted short-term investments as of December 31, 2017 and 2016, respectively.
[3] | The letters of credit sublimit of $60.0 million under the Credit Agreement is part of, not in addition to, the $95.0 million aggregate commitments.
[4] | Certain outstanding letters of credit in the above table originating after October 31, 2014 carry a fee rate of 1.50%

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- Definition The effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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