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Weighted-Average Amortization Period for Intangible Assets Acquired (Eagle Rock) (Detail) (Eagle Rock, USD $)
0 Months Ended
Dec. 07, 2013
Business Acquisition [Line Items]  
Assets Acquired $ 2,400
Noncompete Agreement
 
Business Acquisition [Line Items]  
Assets Acquired $ 2,400
Weighted-average Amortization Period (years) 3 years