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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Income tax expense or benefit $ 0us-gaap_IncomeTaxExpenseBenefit $ 0us-gaap_IncomeTaxExpenseBenefit  
Gross deferred tax assets 38.5us-gaap_DeferredTaxAssetsGross    
Valuation allowance for net deferred tax assets 29.6us-gaap_DeferredTaxAssetsValuationAllowance    
Net deferred tax assets 8.9us-gaap_DeferredTaxAssetsNet    
Deferred tax liabilities 8.9us-gaap_DeferredIncomeTaxLiabilities    
Short term deferred tax liabilities 0.9hbp_ReclassifiedShortTermDeferredTaxAsset    
Current net deferred tax liabilities 8.0us-gaap_DeferredTaxLiabilitiesCurrent 7.9us-gaap_DeferredTaxLiabilitiesCurrent 8.0us-gaap_DeferredTaxLiabilitiesCurrent
Long term deferred tax assets $ 8.0us-gaap_DeferredTaxAssetsNetNoncurrent $ 7.9us-gaap_DeferredTaxAssetsNetNoncurrent $ 8.0us-gaap_DeferredTaxAssetsNetNoncurrent