Acquisition of Oiltanking Partners, L.P., Step 2 (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended	1 Months Ended
Dec. 31, 2014	Feb. 28, 2015
Oiltanking Partners, L.P. [Abstract]
Intangible assets reclassified to goodwill	$ 0
Oiltanking Partners L.P. [Member]
Oiltanking Partners, L.P. [Abstract]
Number of common units issued for each subordinated unit converted (in units)	1
Number of units owned upon conversion (in units)	54,799,604
Limited partner interests acquired (in hundredths)	65.90%
Oiltanking Partners L.P. - Step 2 [Member]
Oiltanking Partners, L.P. [Abstract]
Common units issued in connection with acquisition (in units)		36,827,557
Common units exchanged for each Oiltanking unit (in units)		1.3
Intangible assets reclassified to goodwill		$ 1,460.0

The number of common units exchanged for each common unit of the entity being acquired.

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The number of units owned upon conversion of subordinated units into common units.

+ References

No definition available.

+ Details

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- Definition

Number of shares of equity interests issued or issuable to acquire entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)(4)

-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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Percentage of voting equity interests acquired in a business combination achieved in stages, including equity interests in the acquiree held by the acquirer immediately before the acquisition date and acquired at the acquisition date.

+ References

No definition available.

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- Definition

The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 5

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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