(6) Equity Investment in Savoy (Details) - Condensed Statement of Operations - Savoy (Equity Investmentin SELLP [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Equity Investmentin SELLP [Member]
(6) Equity Investment in Savoy (Details) - Condensed Statement of Operations - Savoy [Line Items]
Revenue	$ 42,248	$ 32,052
Expenses	(29,322)	(27,527)
Net income	$ 12,926	$ 4,525

Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

No definition available.

Name:	hnrg_SELLPRevenues
Namespace Prefix:	hnrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration