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Credit Agreement - Schedule of Credit Agreements (Parenthetical) (Detail) - Credit Agreement [Member] - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Line Of Credit Facility [Line Items] |  |  |  |
Outstanding letters of credit | [1],[2] | $ 2,218,000 | $ 5,070,000 | [3]
BMO Harris Bank N.A. ("BMO Harris") [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Outstanding letters of credit |  | 300,000 | 800,000 |
BMO Harris Bank N.A. ("BMO Harris") [Member] | Letter of Credit [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Letters of credit, sublimit and aggregate commitments |  | 50,000,000 | 95,000,000 |
BMO Harris Bank N.A. ("BMO Harris") [Member] | Letter of Credit Sublimit [Member] |  |  |  |
Line Of Credit Facility [Line Items] |  |  |  |
Letters of credit, sublimit and aggregate commitments |  | $ 25,000,000 | $ 60,000,000 |
[1] | As of December 31, 2017, $5.1 million of restricted short-term investments provided collateral for our letters of credit.
[2] | 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.
[3] | Amounts listed as of and for the year ended December 31, 2017 relate to our previous credit agreement.

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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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