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Accrued Expenses - Schedule of Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Other Income and Expenses [Abstract]    
Accrued salaries, bonuses and related expenses $ 9,865us-gaap_AccruedEmployeeBenefitsCurrent $ 8,923us-gaap_AccruedEmployeeBenefitsCurrent
Accrued property taxes 13,050us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent 12,716us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent
Accrued interest 2,485us-gaap_InterestPayableCurrent 1,822us-gaap_InterestPayableCurrent
Accrued health claims and workers comp 4,026us-gaap_WorkersCompensationLiabilityCurrent 3,608us-gaap_WorkersCompensationLiabilityCurrent
Accrued professional fees 771us-gaap_AccruedProfessionalFeesCurrent 436us-gaap_AccruedProfessionalFeesCurrent
Other 1,957us-gaap_OtherAccruedLiabilitiesCurrent 1,816us-gaap_OtherAccruedLiabilitiesCurrent
Accrued Expenses, Current, Total $ 32,154us-gaap_AccruedLiabilitiesCurrent $ 29,321us-gaap_AccruedLiabilitiesCurrent