Tax Receivable Agreements (Aggregate Payments Due Under Tax Receivable Agreements (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Related Party Transaction [Line Items]
2021	$ 20,234
2022	22,394
2023	67,468
2024	45,909
2025	26,358
Thereafter	132,421
Gross expected payments	314,784
Less: Amounts representing discount	(116,724)
Total tax receivable agreement obligations due to related parties	198,060
Less: Current portion due	(20,234)
Tax receivable agreement long-term obligations due to related parties	177,826
Tax Receivable Agreements 2009-2011 [Member]
Related Party Transaction [Line Items]
2021	18,714
2022	20,113
2023	20,084
2024	19,358
2025	17,917
Thereafter	102,942
Gross expected payments	199,128
Less: Amounts representing discount	(55,945)
Total tax receivable agreement obligations due to related parties	143,183
Less: Current portion due	(18,714)
Tax receivable agreement long-term obligations due to related parties	124,469
Tax Receivable Agreement 2017 [Member]
Related Party Transaction [Line Items]
2021	1,520
2022	2,281
2023	47,384
2024	26,551
2025	8,441
Thereafter	29,479
Gross expected payments	115,656
Less: Amounts representing discount	(60,779)
Total tax receivable agreement obligations due to related parties	54,877
Less: Current portion due	(1,520)
Tax receivable agreement long-term obligations due to related parties	$ 53,357