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Schedule of Accrued Cost and Expenses (Detail) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Accounts Payable and Accrued Liabilities Current [Abstract]
Payroll and related payables		$ 18,204	$ 17,447
Commissions payable	[1]	2,375	1,990
Accrued vessel expenses		27,050	29,534
Accrued interest expense		5,610	5,985
Other accrued expenses		3,436	6,828
Accrued cost and expenses		$ 56,675	$ 61,784
[1] Excludes $24.8 million and $28.0 million of commissions due to Sonatide at June 30, 2019 and December 31, 2018, respectively. These amounts are included in amounts due to affiliate.

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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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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).

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