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Derivatives Hedges and Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Embedded derivative | $ (1,642) | $ (2,660)
Recurring [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Other | 533 |
Total | 533 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Embedded derivative | (1,642) | (2,660)
Other | (533) |
Total | (2,175) | $ (2,660)
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Assets - Supplies, prepaid items and other: |  |
Other | 533 |
Total | 533 |
Liabilities - Current and noncurrent accrued and other liabilities: |  |
Embedded derivative | (1,642) |
Other | (533) |
Total | $ (2,175) |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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