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Commitments And Contingencies (Schedule Of Activity Related To Asbestos Claim) (Detail) (Asbestos Commitments and Contingencies) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012 | Mar. 31, 2013 Maritime Claims Claim | Dec. 30, 2009 Maritime Claims Claim
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Beginning claims | 56,442 |  | 58,658 |  | 58,658 |  |  |
New claims | 792 |  | 893 |  | 3,542 |  |  |
Settlements | (237) |  | (289) |  | (1,030) |  |  |
Dismissals | (789) |  | (2,042) |  | (4,919) |  |  |
Number Of Activated Maritime Claims | 0 | [1] | 178 | [1] | 191 | [1] |  |
MARDOC claims |  |  |  |  |  |  | 3,391 |
Number_Restored_Dismissed_Maritime_Claims |  |  |  |  |  |  | 457 |
Net_Number_Restored_Maritime_Claims |  |  |  |  |  |  | 2,934 |
Ending claims | 56,208 |  | 57,398 |  | 56,442 |  |  |
Claims permanently dismissed |  |  |  |  |  |  | 26,562 |
Remaining Claims |  |  |  |  |  |  | 6,503 |
Total number of maritime claims |  |  |  |  |  |  |  | 36,448
[1] | As of January 1, 2010, the Company was named in 36,448 maritime actions which had been administratively dismissed by the United States District Court for the Eastern District of Pennsylvania ("MARDOC claims"), and therefore were not classified as active claims. In addition, the Company was named in 8 new maritime actions in 2010 (also not classified as active claims). Through March 31, 2013, pursuant to an ongoing review process initiated by the Court, 26,562 claims were permanently dismissed, and 3,391 claims were classified as active, of which 457 claims were subsequently dismissed, and 2,934 claims remain active (and have been added to "Ending claims"). The Company expects that more of the remaining 6,503 maritime actions will be activated, or permanently dismissed, as the Court's review process continues. The number on this line reflects the number of previously inactive MARDOC claims that were newly activated in a given period

X
- Definition The number of asbestos claims dismissed during the period. + References No definition available. + Details
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Namespace Prefix: | cr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of asbestos claims settled during the period. + References No definition available. + Details
Name: | cr_LossContingencyClaimsSettlementsNumber
Namespace Prefix: | cr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The total number of claims related to maritime actions which were remain in active status and included in ending claims. + References No definition available. + Details
Name: | cr_NetNumberRestoredMaritimeClaims
Namespace Prefix: | cr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of previously inactive MARDOC claims that were newly activated in a given period + References No definition available. + Details
Name: | cr_NumberOfActivatedMaritimeClaims
Namespace Prefix: | cr_
Data Type: | xbrli:integerItemType
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Period Type: | duration

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- Definition The total number of claims related to maritime actions which were restored to active status and included in ending claims. + References No definition available. + Details
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Namespace Prefix: | cr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The total number of claims related to maritime actions which were restored to active status and subsequently dismissed. + References No definition available. + Details
Name: | cr_NumberRestoredDismissedMaritimeClaims
Namespace Prefix: | cr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The total number of claims related to maritime actions not included in beginning claims. + References No definition available. + Details
Name: | cr_TotalNumberOfMaritimeClaims
Namespace Prefix: | cr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The total number of claims related to maritime actions which were permanently dismissed and excluded from total claims. + References No definition available. + Details
Name: | cr_TotalNumberOfPermanentlyDismissedMaritimeClaims
Namespace Prefix: | cr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The total number of remaining claims related to maritime actions excluded from total claims. + References No definition available. + Details
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Namespace Prefix: | cr_
Data Type: | xbrli:integerItemType
Balance Type: | na
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- Details
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Data Type: | xbrli:stringItemType
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- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9, 10, 11, 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The total amount of pending claims pertaining to a loss contingency accrual as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9, 10, 11, 12 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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Period Type: | instant