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Schedule of Accrued Expenses (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Schedule of Accrued Liabilities [Line Items] |  |  |
Commissions payable | [1] | $ 1,990 | $ 1,898
Other accrued expenses | [2] | 6,828 | 2,306
Sonatide joint venture |  |  |
Schedule of Accrued Liabilities [Line Items] |  |  |
Commissions payable |  | 28,000 | $ 36,400
St. Rose and New Orleans, Louisiana, Houston Texas and Aberdeen, Scotland |  |  |
Schedule of Accrued Liabilities [Line Items] |  |  |
Other accrued expenses |  | 1,500 |
Charge incurred on abandonment of office leases |  | $ 5,500 |
[1] | Excludes $28.0 million and $36.4 million of commissions due to Sonatide at December 31, 2018 and 2017, respectively. These amounts are included in amounts due to affiliates.
[2] | Includes $1.5 million as of December 31, 2018 related to a $5.5 million charge incurred during the twelve months ended December 31, 2018 relating to the abandonment of office leases for duplicate facilities in St. Rose and New Orleans, Louisiana, Houston Texas and Aberdeen, Scotland

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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for sales commissions. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + 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 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6911-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765 + Details
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- Definition Amount of gain (loss) on termination of lease before expiration of lease term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 40 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77888415&loc=SL77918607-209975 + Details
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