Condensed Combined Debtor-In-Possession Financial Information - Condensed Combined Statements of Operations Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2015
Contractual Interest Expense	$ 24,691	$ 74,070
Debtor In Possession
Contractual Interest Expense	$ 24,691	$ 74,070

The amount of contractual interest expense recognized and unrecognized in the statement of operations. The unrecognized contractual expense relates to contractual interest expense not included in the statement of operations.

No definition available.

Name:	heroq_ContractualInterestExpenseRecognizedAndUnrecognizedInStatementOfOperations
Namespace Prefix:	heroq_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration