Noncurrent Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Other Non-Current Liabilities [Line Items]
Other	$ 4,811	$ 4,642
Other noncurrent liabilities	170,292	164,630
Contingent Consideration Under Tax Receivables Agreement
Other Non-Current Liabilities [Line Items]
Contingent consideration	144,348	137,288
Contingent Consideration For Achievement Of Specified Average Adjusted Ebitda
Other Non-Current Liabilities [Line Items]
Contingent consideration	$ 21,133	$ 22,700