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Credit Agreement - Schedule of Credit Agreement (Parenthetical) (Detail) - Credit Agreement [Member] - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Line Of Credit Facility [Line Items] |  |  |
Outstanding letters of credit | [1] | $ 2,218,000 | $ 2,218,000
BMO Harris Bank N.A. ("BMO Harris") [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Outstanding letters of credit |  |  | 300,000
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 |  | 50,000,000.0 | 50,000,000.0
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 |  | $ 25,000,000.0 | $ 25,000,000.0
[1] | As of December 31, 2018, outstanding letters of credit not related to the credit agreement totaled $0.3 million, fully collateralized with restricted cash.

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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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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- Details
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