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Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Dec. 01, 2016
--- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Embedded Derivative, Fair Value of Embedded Derivative Asset | $ 18,190 |  | $ 10,800
Fair Value, Measurements, Recurring |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative financial instruments - assets | 2,043 |  |
Embedded Derivative, Fair Value of Embedded Derivative Asset | 18,190 | $ 10,783 |
Derivative financial instruments - liabilities | 2,602 |  |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative financial instruments - assets | 0 | 0 |
Embedded Derivative, Fair Value of Embedded Derivative Asset | 0 | 0 |
Derivative financial instruments - liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative financial instruments - assets | 2,043 | 2,364 |
Embedded Derivative, Fair Value of Embedded Derivative Asset | 18,190 | 10,783 |
Derivative financial instruments - liabilities | 2,602 | 7,562 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative financial instruments - assets | 0 | 0 |
Embedded Derivative, Fair Value of Embedded Derivative Asset | 0 | 0 |
Derivative financial instruments - liabilities | $ 0 | $ 0 |

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- Definition Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + 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 Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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