Other Revenues and Restructuring Charges (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Revenue earned	$ 526,896	$ 514,193	$ 250,002
Amortization of in-process revenue contracts	1,200	4,800
Restructuring charges	0	4,772	$ 0
Special Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		4,400
Reimbursement revenue		4,400
Ship to Ship Transfer Business [Member] \| Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs related to severance payments made in relation to acquisition		300
Ship-to-Ship Transfer [Member]
Restructuring Cost and Reserve [Line Items]
Revenue earned	$ 37,900	$ 17,700

Amount of non-cash amortization of intangible asset (liability) for above and below market leases.

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- Definition

Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.

+ References

No definition available.

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- Definition

Repayment received or receivable for expenses incurred on behalf of a client or customer, other than those reimbursements received by landlords from tenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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-Publisher FASB
-Name Accounting Standards Codification
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-Name Accounting Standards Codification
-Topic 420
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-Name Accounting Standards Codification
-Topic 420
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-Section S99
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section P
-Subsection 3, 4

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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