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Retirement Plans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets	7.00%	7.50%
Contribution percentage to defined contribution plan	94.00%
Pension plan defined benefit plan cost increase limit percentage	4.00%
Aggregate contributions to the plans	$ 18,213,000	$ 24,077,000	$ 23,356,000
Seafarers Pension Trust [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension contributions	$ 877,000	$ 1,202,000
Contribution percentage to defined contribution plan	100.00%
Maximum contribution limit	5.00%

X

- Definition

Represents maximum entity's contribution limit to the concerned pension trust during the reporting period.

+ References

No definition available.

+ Details

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Namespace Prefix:	kex_
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Balance Type:	na
Period Type:	duration

X

- Definition

Refers to percentage of defined contribution plan contribution during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	kex_
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X

- Definition

Refers to percentage of pension plan defined benefit plan cost increase limit during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	kex_
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Balance Type:	na
Period Type:	duration

X

- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Expected Long-Term Rate of Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512046

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

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.

+ References

No definition available.

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Namespace Prefix:	us-gaap_
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X

- Definition

The amount of the cost recognized during the period for defined contribution plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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X

- Definition

The amount of cash or cash equivalents contributed by the entity to fund its pension plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585

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- Details

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