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Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transactions (Textual)
Management fee to affiliate	$ 1,400	$ 5,500	$ 5,500
Revenue from Related Parties	3,900	41,800	43,000
Accounts receivable	0	7,000
Loans	2,153,618
Debt Instrument, Face Amount	1,325,000
Topco [Member] | 2014 Topco Acquisition [Member] | Intercompany Loan Agreements [Member]
Related Party Transactions (Textual)
Debt Instrument, Face Amount	6,000
Topco [Member] | 2014 Topco Acquisition [Member] | New Intercompany Loan Agreement [Member]
Related Party Transactions (Textual)
Debt Instrument, Face Amount	$ 6,000
Debt Instrument, Interest Rate, Stated Percentage	0.39%
Debt instrument, maturity date	Dec. 31, 2023
First Lien Term Loan [Member]
Related Party Transactions (Textual)
Loans		100,200
Second Lien Term Loan [Member]
Related Party Transactions (Textual)
Loans		31,100
New Term Loan Facility [Member]
Related Party Transactions (Textual)
Loans	$ 11,300
Board of Directors Chairman [Member]
Related Party Transactions (Textual)
Revenue from Related Parties	16,400	5,400
Accounts receivable	0	100
Board of Directors Chairman [Member] | Topco [Member]
Related Party Transactions (Textual)
Revenue from Related Parties	200
Accounts receivable	100
Majority-Owned Subsidiary, Unconsolidated [Member]
Related Party Transactions (Textual)
Revenue from Related Parties	19,600	21,900	$ 23,500
Accounts receivable	$ 2,200	$ 2,200

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For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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