Quarterly report pursuant to Section 13 or 15(d)

Debt - Additional Information (Detail)

v2.4.1.9
Debt - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Jan. 31, 2014
Line Of Credit Facility [Line Items]    
Borrowings under credit facility $ 15.0us-gaap_LineOfCredit  
Debt maturity period 2019-12  
Maximum    
Line Of Credit Facility [Line Items]    
Maximum borrowing capacity above amount borrowed 5.0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Ratio of indebtedness to net capital 1.5us-gaap_RatioOfIndebtednessToNetCapital1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Fair value inputs earnings before interest taxes depreciation and amortization multiple 3.0us-gaap_FairValueInputsEarningsBeforeInterestTaxesDepreciationAndAmortizationMultiple
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Revolving Credit Facility    
Line Of Credit Facility [Line Items]    
Borrowings under credit facility   $ 65.0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember