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Deferred Finance Costs - Summary of Deferred Financing Cost (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Gross cost $ 2.6us-gaap_DeferredFinanceCostsGross $ 2.6us-gaap_DeferredFinanceCostsGross
Accumulated amortization (1.5)us-gaap_AccumulatedAmortizationDeferredFinanceCosts (0.8)us-gaap_AccumulatedAmortizationDeferredFinanceCosts
Deferred Finance Costs, Net $ 1.1us-gaap_DeferredFinanceCostsNet $ 1.8us-gaap_DeferredFinanceCostsNet