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Affiliates Balances - Additional Information (Detail) - Sonatide Marine, Ltd. $ in Millions | 6 Months Ended
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Jun. 30, 2019 USD ($) Vessel
Schedule Of Equity Method Investments [Line Items] |
Due from affiliate current net after offsetting due to affiliate | $ 67.0
Cash | $ 51.0
Number of vessels operating | Vessel | 3
Number of vessels stacked | Vessel | 1
Angola, Kwanza |
Schedule Of Equity Method Investments [Line Items] |
Cash | $ 15.0
Trade Accounts Receivable |
Schedule Of Equity Method Investments [Line Items] |
Net trade accounts receivable | $ 19.0

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 2: 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(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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