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Credit Agreement - Schedule of Credit Agreements (Parenthetical) (Detail) - Credit Agreement [Member] - USD ($) | Dec. 31, 2016 | Dec. 31, 2015
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Line Of Credit Facility [Line Items] |  |  |
Outstanding letters of credit | [1],[2] | $ 8,597,000 | $ 10,446,000
BMO Harris Bank N.A. (“BMO Harris”) [Member] |  |  |
Line Of Credit Facility [Line Items] |  |  |
Letter of credit collateralized of restricted cash |  | 8,600,000 | 10,400,000
Outstanding letters of credit |  | 1,400,000 | 1,400,000
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 |  | 95,000,000 | 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 |  | $ 60,000,000 | $ 60,000,000
[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.

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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://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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