v2.4.0.6

Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013
Mr. and Ms. Thomas [Member] |
Related Party Transaction [Line Items] |
Cash payments remained to be paid | $ 1.0
Share based Compensation due to accelerated vesting | 1.5
Mr. Thomas [Member] |
Related Party Transaction [Line Items] |
Cash payouts to be made under separation agreements | 0.8
Ms. Thomas [Member] |
Related Party Transaction [Line Items] |
Cash payouts to be made under separation agreements | $ 0.4

X
- Definition Cash payments remained to be paid as of the balance sheet date. + References No definition available. + Details
Name: | epax_CashPaymentsRemainedToBePaid
Namespace Prefix: | epax_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Cash payouts to be made under the terms of separation agreements. + References No definition available. + Details
Name: | epax_CashPayoutsUnderSeparationAgreements
Namespace Prefix: | epax_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate amount of noncash, equity-based employee remuneration due to accelerated vesting. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References No definition available. + Details
Name: | epax_ShareBasedCompensationDueToAcceleratedVesting
Namespace Prefix: | epax_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration