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Schedule of Accrued Cost and Expenses (Parenthetical) (Detail) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Schedule Of Accrued Liabilities [Line Items]
Commissions payable	[1]	$ 2,320	$ 1,990
Sonatide joint venture
Schedule Of Accrued Liabilities [Line Items]
Commissions payable		$ 29,400	$ 28,000
[1] Excludes $29.4 million and $28.0 million of commissions due to Sonatide at March 31, 2019 and December 31, 2018, respectively. These amounts are included in amounts due to affiliate.

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- Definition

Schedule of Accrued Liabilities [Line Items]

+ References

No definition available.

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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

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