Acquisitions (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Jun. 30, 2012
Business Acquisition [Line Items]
Tax deductible goodwill	$ 30,975	$ 28,675
Pelichem Industrial Cleaning Services, LLC [Member]
Business Acquisition [Line Items]
Current assets	1,140
Property, plant, and equipment	4,032
Tax deductible goodwill	2,237
Other intangible assets	1,853
Total assets acquired	9,262
Current liabilities	86
Net assets acquired	9,176
Estimated working capital adjustment	926
Purchase price before working capital adjustment	$ 8,250