Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliations of Effective Income Tax Rate to Federal Statutory Rate (Detail)

v2.4.1.9
Income Taxes - Reconciliations of Effective Income Tax Rate to Federal Statutory Rate (Detail)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Income tax expense at the statutory rate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State and local income tax expense 4.06%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes (0.35%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Foreign income tax 2.86%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (2.88%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Permanent differences 2.06%infu_EffectiveIncomeTaxRateReconciliationPermanentDifferences 2.85%infu_EffectiveIncomeTaxRateReconciliationPermanentDifferences
Other adjustments 2.96%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 4.58%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate 45.94%us-gaap_EffectiveIncomeTaxRateContinuingOperations 38.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations