Quarterly report pursuant to Section 13 or 15(d)

Debt - Summary of Company's Current and Long-Term Debt (Including Capital Leases) (Detail)

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Debt - Summary of Company's Current and Long-Term Debt (Including Capital Leases) (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Line of Credit Facility [Line Items]    
Current portion of long-term debt $ 5,537us-gaap_LongTermDebtCurrent $ 6,452us-gaap_LongTermDebtCurrent
Long-Term Debt 28,080us-gaap_LongTermDebtNoncurrent 19,032us-gaap_LongTermDebtNoncurrent
Total 33,617us-gaap_LongTermDebt 25,484us-gaap_LongTermDebt
Term Loans [Member]    
Line of Credit Facility [Line Items]    
Current portion of long-term debt 2,895us-gaap_LongTermDebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= infu_TermLoansMember
4,238us-gaap_LongTermDebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= infu_TermLoansMember
Long-Term Debt 24,105us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= infu_TermLoansMember
15,849us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= infu_TermLoansMember
Total 27,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= infu_TermLoansMember
20,087us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= infu_TermLoansMember
Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Long-Term Debt 1,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
566us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
Total 1,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
566us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
Capital Lease Obligations [Member]    
Line of Credit Facility [Line Items]    
Current portion of long-term debt 2,642us-gaap_LongTermDebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
2,214us-gaap_LongTermDebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
Long-Term Debt 2,975us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
2,617us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
Total $ 5,617us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember
$ 4,831us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CapitalLeaseObligationsMember