Capital Stock (Details) $ in Millions	Jun. 19, 2014 USD ($) shares
Capital Stock [Abstract]
Maximum amount receivable from sale of securities under shelf registration \| $	$ 300.0
Maximum limit of shares sold by stockholders \| shares	3,000,000

Maximum amount receivable from sale of securities under shelf registration.

No definition available.

Name:	cap_MaximumAmountOfSecuritiesOfferedUnderShelfRegistration
Namespace Prefix:	cap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration