Equity - Classification of Assets and Liabilities (Details) - Variable Interest Entity, Primary Beneficiary $ in Thousands	Jun. 30, 2018 USD ($)
Variable Interest Entity [Line Items]
Total Assets	$ 428,610
Total Liabilities	233,886
Total current assets
Variable Interest Entity [Line Items]
Total Assets	254,344
Cash and cash equivalents
Variable Interest Entity [Line Items]
Total Assets	35,599
Accounts receivable
Variable Interest Entity [Line Items]
Total Assets	132,011
Other current assets
Variable Interest Entity [Line Items]
Total Assets	86,734
Total non-current assets
Variable Interest Entity [Line Items]
Total Assets	174,266
Goodwill
Variable Interest Entity [Line Items]
Total Assets	120,343
Other assets
Variable Interest Entity [Line Items]
Total Assets	53,923
Total current liabilities
Variable Interest Entity [Line Items]
Total Liabilities	117,506
Accounts payable and Accrued Liabilities
Variable Interest Entity [Line Items]
Total Liabilities	94,870
Contingent consideration
Variable Interest Entity [Line Items]
Total Liabilities	2,980
Other current liabilities
Variable Interest Entity [Line Items]
Total Liabilities	19,656
Total long-term liabilities
Variable Interest Entity [Line Items]
Total Liabilities	116,380
Long-term portion of Senior Credit Facility
Variable Interest Entity [Line Items]
Total Liabilities	102,000
Subordinated debt — affiliate
Variable Interest Entity [Line Items]
Subordinated debt	10,000
Other long-term liabilities
Variable Interest Entity [Line Items]
Total Liabilities	$ 4,380