Common stock dividend per share declared.

No definition available.

Name:	cot_CommonStockDividendPerShareDeclared
Namespace Prefix:	cot_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt instrument early redemption premium payment.

+ References

No definition available.

+ Details

Name:	cot_DebtInstrumentEarlyRedemptionPremiumPayment
Namespace Prefix:	cot_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Write off of deferred financing fees and discount charges.

+ References

No definition available.

+ Details

Name:	cot_WriteOffOfDeferredFinancingFeesAndDiscountCharges
Namespace Prefix:	cot_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph e

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchasedFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

+ Details

Name:	us-gaap_DividendPayableDateToBePaidDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the dividend to be paid was declared, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_DividendsPayableDateDeclaredDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_DividendsPayableDateOfRecordDayMonthAndYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration

Subsequent Event - Additional Information (Detail) In Millions, except Per Share data, unless otherwise specified	0 Months Ended	12 Months Ended	0 Months Ended		0 Months Ended
	Nov. 15, 2013 USD ($)	Dec. 28, 2013	Feb. 19, 2014 Subsequent Event [Member] USD ($)	Feb. 11, 2014 Subsequent Event [Member] CAD	Feb. 19, 2014 Subsequent Event [Member] 2017 Notes [Member] USD ($)
Subsequent Event [Line Items]
Dividend per common share				0.06
Dividend declared date		Feb. 11, 2014
Dividend declared payable date		Mar. 28, 2014
Dividend shareholders date of record		Mar. 11, 2014
Aggregate principal amount of debt to be redeemed	$ 200.0		$ 15.0		$ 15.0
Redemption price of note as a percentage of par	104.118%		104.118%		104.118%
Premium payment liability					0.6
Deferred financing fee and discount charges			$ 0.3