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Debt - Schedule of Debt Obligations (Parenthetical) (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | Nov. 14, 2014
--- | --- | --- | ---
Term Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate on debt | 5.40% | 5.10% |
Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate on debt | 11.00% | 11.00% |
Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Available capacity | $ 300.0 | $ 130.0 | $ 130.0
Revolving Credit Facility [Member] | Letter of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Available capacity | $ 2.7 | $ 2.9 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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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- Details
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- Details
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