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(5) Other Long-Term Assets and Other Income (Detail) - Other Assets (Assets [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Assets [Member]
   
Other assets:    
Advance coal royalties $ 3,241 $ 3,205
Marketable equity securities available for sale at fair value (restricted)* 3,633 [1] 2,326 [1]
Miscellaneous 1,893 763
$ 8,767 $ 6,294
[1] *Held by Sunrise Indemnity, Inc., our wholly-owned captive insurance company.