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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2014
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events During the three and six months ended June 30, 2014, NACoal recognized a $1.0 million after-tax charge to establish an allowance against the receivable from NACC India's customer as a result of its Indian customer disputing, and ultimately defaulting on, its contractual payment obligations. As a result of this default, NACC India has terminated its contract with the Indian customer, and intends to pursue its contractual remedies. On July 29, 2014, HBB amended its $115.0 million secured, floating-rate revolving credit facility (the “Amended HBB Facility”), extending the term through July 2019. The terms of the Amended HBB Facility are substantially similar to the terms under the existing HBB Facility.