Significant Risks And Uncertainties - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Novation
Unusual Risk or Uncertainty [Line Items]
Customer revenue as a percentage of net revenue	33.00%	33.00%	33.00%
Broadlane And Medassets | Minimum
Unusual Risk or Uncertainty [Line Items]
Customer revenue as a percentage of net revenue	24.00%	24.00%	24.00%
Broadlane And Medassets | Maximum
Unusual Risk or Uncertainty [Line Items]
Customer revenue as a percentage of net revenue	25.00%	25.00%	25.00%
Premier | Minimum
Unusual Risk or Uncertainty [Line Items]
Customer revenue as a percentage of net revenue	21.00%	21.00%	21.00%
Premier | Maximum
Unusual Risk or Uncertainty [Line Items]
Customer revenue as a percentage of net revenue	24.00%	24.00%	24.00%
Covidien Ltd. | Minimum
Unusual Risk or Uncertainty [Line Items]
Sales of product from supplier as a percentage of revenue	13.00%	13.00%	13.00%
Covidien Ltd. | Maximum
Unusual Risk or Uncertainty [Line Items]
Sales of product from supplier as a percentage of revenue	14.00%	14.00%	14.00%
Johnson & Johnson Healthcare Systems, Inc. | Minimum
Unusual Risk or Uncertainty [Line Items]
Sales of product from supplier as a percentage of revenue	9.00%	9.00%	9.00%
Johnson & Johnson Healthcare Systems, Inc. | Maximum
Unusual Risk or Uncertainty [Line Items]
Sales of product from supplier as a percentage of revenue	10.00%	10.00%	10.00%