Business Combinations - Additional Information (Details) (USD $)	12 Months Ended			0 Months Ended	4 Months Ended	0 Months Ended	7 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 22, 2014	Dec. 31, 2014	May 21, 2012	Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Purchase price of acquisition	$ 20,723,000	$ 0	$ 156,312,000
Goodwill	122,720,000	111,343,000	111,407,000		122,720,000		111,407,000
Surgichem [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Purchase price of acquisition				20,700,000
Cash acquired from Acquisition				200,000
Intangible assets acquired				5,730,000
Goodwill				12,112,000
Acquisition generated revenue					4,600,000
Income (Loss) from operations					(100,000)
Total revenue	13,300,000	11,900,000
Acquisition deferred tax liabilities				1,104,000
Surgichem [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired				5,400,000
Acquired intangible assets, useful life (in years)				18 years
Surgichem [Member] | Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired				300,000
Acquired intangible assets, useful life (in years)				1 year
MedPak Holdings, Inc. [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Purchase price of acquisition						156,300,000
Cash acquired from Acquisition						2,000,000
Intangible assets acquired						83,900,000
Goodwill						82,800,000
Acquisition generated revenue							47,200,000
Income (Loss) from operations							2,900,000
Acquisition deferred tax liabilities						33,386,000
MedPak Holdings, Inc. [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired						50,500,000
MedPak Holdings, Inc. [Member] | Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired						6,800,000
Acquired intangible assets, useful life (in years)						12 years
Minimum [Member] | MedPak Holdings, Inc. [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, useful life (in years)						12 years
Minimum [Member] | MedPak Holdings, Inc. [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, useful life (in years)						28 years
Maximum [Member] | MedPak Holdings, Inc. [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, useful life (in years)						30 years
Maximum [Member] | MedPak Holdings, Inc. [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Acquired intangible assets, useful life (in years)						30 years
Selling, General and Administrative Expenses [Member] | Surgichem [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Acquisition Related Costs	1,100,000
Acquisition expense reimbursement	(500,000)				(500,000)
Selling, General and Administrative Expenses [Member] | MedPak Holdings, Inc. [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Acquisition Related Costs		$ 3,200,000