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Fair Value of Financial Instruments - Additional Information (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Borrowings under construction term loan $ 394,800,000us-gaap_ConstructionLoanNoncurrent $ 397,800,000us-gaap_ConstructionLoanNoncurrent
Long-Term Debt 605,652,000us-gaap_LongTermDebtNoncurrent 610,522,000us-gaap_LongTermDebtNoncurrent
Senior Secured Notes    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Long-Term Debt $ 230,200,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= hifr_SeniorSecuredNotesMember		 $ 231,900,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= hifr_SeniorSecuredNotesMember
Debt Instrument, weighted average rate 6.42%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= hifr_SeniorSecuredNotesMember		 6.43%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= hifr_SeniorSecuredNotesMember