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Summary of Significant Accounting Policies - Global Wells (Details) - Global Wells $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
Variable Interest Entity [Line Items] |
Ownership interest (as a percent) | 13.50%
Voting interest (as a percent) | 25.00%
Minimum bank account to make additional contributions from members | $ 50
Contributions to offset the amount that member cannot contribute (up to) | $ 25

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- Definition Represents the contributions to offset the amount that member cannot contribute. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the minimum bank account to make additional contributions from members. + References No definition available. + Details
Name: | krt_MinimumBankAccountToMakeAdditionalContributionsFromMembers
Namespace Prefix: | krt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Percentage of the Variable Interest Entity's voting interest owned by (or beneficial interest in) the reporting entity. + References No definition available. + Details
Name: | krt_VariableInterestEntityQualitativeOrQuantitativeInformationVotingPercentage
Namespace Prefix: | krt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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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. + Details
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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=123419778&loc=SL6759159-111685 + Details
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Data Type: | dtr-types:percentItemType
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |