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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, 2016 | Dec. 31, 2015
Credit Agreement: |  |  |
Credit facility remaining availability |  | $ 86,403 | $ 46,554
Credit facility borrowings |  |  | 38,000
Outstanding letters of credit | [1],[2] | 8,597 | 10,446
Availability of additional letters of credit | [3] | 51,403 | 49,554
Weighted average daily revolving credit borrowings for the year ended |  | $ 19 | $ 3
Weighted average annual interest rate |  | 1.93% | 1.92%
Commitment fee rate |  | 0.25% | 0.25%
Letter of credit fee rate |  | 0.75% | 0.75%
[1] | As of December 31, 2016 and 2015, outstanding letters of credit not related to the Credit Agreement totaled $1.4 million for each year, respectively, which amount is fully collateralized with restricted cash and investments, which is in addition to the $8.6 million and $10.4 million, respectively, referenced in this Note 10.
[2] | Represents letters of credit which are fully collateralized with $8.6 million and $10.4 million of restricted cash as of December 31, 2016 and 2015, 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.

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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 Line of credit facility, maximum weighted borrowing capacity per day. + References No definition available. + Details
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- Definition Line of credit facility percentage of letter of credit fee rate. + 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 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://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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=6876686&loc=d3e534808-122878 + Details
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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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- 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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