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Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
Gross $ 11,624us-gaap_FiniteLivedIntangibleAssetsGross  
Accumulated Amortization (1,561)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization  
Net $ 10,063us-gaap_FiniteLivedIntangibleAssetsNet $ 10,709us-gaap_FiniteLivedIntangibleAssetsNet
Weighted Average Remaining Useful Life (years) 15 years 7 months 6 days