Capital Stock (Details)	Jun. 19, 2014 USD ($)
Capital Stock [Abstract]
Maximum amount receivable from sale of securities under shelf registration	$ 300,000,000
Maximum limit of shares sold by stockholders	$ 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