Acquisitions - Business Combination Transfer Consideration (Parenthetical) (Detail) (Calypso [Member], USD $) In Millions, unless otherwise specified	Mar. 29, 2014
Calypso [Member]
Business Acquisition [Line Items]
Undiscounted deferred consideration	$ 5.3

Business combination consideration transferred deferred consideration undiscounted amount.

No definition available.

Name:	cot_BusinessCombinationConsiderationTransferredDeferredConsiderationUndiscountedAmount
Namespace Prefix:	cot_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant