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Long-Term Debt - Summary of Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Aug. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Capital lease obligations	$ 16,340
Less: unamortized debt issuance costs and discount	0
Debt and capital lease obligations	2,193,334
Less: Current maturities	48,472
Total long-term debt	2,144,862
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	0
Line of Credit \| 2014 First Lien Credit Agreement
Debt Instrument [Line Items]
Long-term debt	0
Secured Debt \| 2017 Senior Secured Credit Facility - Term Loan
Debt Instrument [Line Items]
Long-term debt	1,283,626
Secured Debt \| Revolving Credit Facility \| 2017 Senior Secured Credit Facility - Revolver
Debt Instrument [Line Items]
Long-term debt	0
Senior Notes \| Senior Unsecured Notes Due 2021
Debt Instrument [Line Items]
Long-term debt	409,821
Senior Notes \| Senior Unsecured Notes Due 2025
Debt Instrument [Line Items]
Long-term debt	370,000
Subordinated Notes
Debt Instrument [Line Items]
Long-term debt	0
Notes payable and secured loans
Debt Instrument [Line Items]
Long-term debt	$ 113,547
Predecessor
Debt Instrument [Line Items]
Capital lease obligations			$ 13,996
Less: unamortized debt issuance costs and discount			(32,274)
Debt and capital lease obligations			1,442,243
Less: Current maturities			27,822
Total long-term debt			1,414,421
Predecessor \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt			85,000
Predecessor \| Line of Credit \| 2014 First Lien Credit Agreement
Debt Instrument [Line Items]
Long-term debt			932,000
Predecessor \| Secured Debt \| 2017 Senior Secured Credit Facility - Term Loan
Debt Instrument [Line Items]
Long-term debt			0
Less: unamortized debt issuance costs and discount		$ (18,800)
Predecessor \| Secured Debt \| Revolving Credit Facility \| 2017 Senior Secured Credit Facility - Revolver
Debt Instrument [Line Items]
Long-term debt			0
Less: unamortized debt issuance costs and discount		$ (9,400)
Predecessor \| Senior Notes \| Senior Unsecured Notes Due 2021
Debt Instrument [Line Items]
Long-term debt			400,000
Predecessor \| Senior Notes \| Senior Unsecured Notes Due 2025
Debt Instrument [Line Items]
Long-term debt			0
Predecessor \| Subordinated Notes
Debt Instrument [Line Items]
Long-term debt			1,000
Predecessor \| Notes payable and secured loans
Debt Instrument [Line Items]
Long-term debt			$ 42,521