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Description of Business and Significant Accounting Policies - Additional Information (Details)
3 Months Ended
Mar. 31, 2015
Segment
Summary Of Significant Accounting Policy [Line Items]  
Number of reportable segments as result of acquisitions 1us-gaap_NumberOfReportableSegments
Maximum | Geographic Concentration Risk | Sales Revenue, Net  
Summary Of Significant Accounting Policy [Line Items]  
Concentration risk, percentage 1.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember