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Short-Term Borrowing (Details Textual) (USD $) In Millions, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2012 | Jun. 22, 2012
Short Term Borrowing (Textual) [Abstract] |  |
Short-term credit facility | 0 |
Previous Maximum Borrowing Capacity |  | 100
Short-term loan maximum borrowing capacity |  | 140
Maximum Aggregate Short Term Borrowing Authorized by our Board of Directors |  | 85
Revolving Credit Note [Member] |  |
Short Term Borrowing (Textual) [Abstract] |  |
Short-term credit facility |  | 40
Credit facility maturing date | Jun. 01, 2013 |
Previous Maximum Borrowing Capacity |  | 50
Short-term loan maximum borrowing capacity |  | $ 90
Revolving Credit Note [Member] | LIBOR [Member] |  |
Short Term Borrowing (Textual) [Abstract] |  |
Short-term credit facility, interest description | LIBOR plus 80 basis points |
Short-term credit facility, base rate |  | 0.80%
Revolving Credit Note [Member] | Lender's Base Rate [Member] |  |
Short Term Borrowing (Textual) [Abstract] |  |
Short-term credit facility, interest description | lender’s Base Rate plus 80 basis points |
Short-term credit facility, base rate |  | 0.80%

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- Definition Maximum aggregate short-term borrowing authorized by our board of directors. + References No definition available. + Details
Name: | cpk_MaximumAggregateShortTermBorrowingAuthorizedByOurBoardOfDirectors
Namespace Prefix: | cpk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Previous maximum borrowing capacity. + References No definition available. + Details
Name: | cpk_PreviousMaximumBorrowingCapacity
Namespace Prefix: | cpk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | cpk_ShortTermBorrowingTextualAbstract
Namespace Prefix: | cpk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant