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Income Tax - Schedule of net deferred tax assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax asset:    
Accrued liabilities $ 77,599 $ 70,420
Interest expense 20,851 49,586
Social security tax deferral 12,656  
Net operating losses 10,557 7,671
Right-of-use liabilities 11,996 26,648
Transaction expenses 8,643 5,325
Debt issuance costs 6,422 973
Acquired intangibles, including goodwill 2,205 2,292
Insurance reserves 2,262 2,403
Other 4,755 6,158
Total deferred tax assets 157,946 171,476
Deferred tax liabilities    
Acquired intangibles including goodwill 618,697 636,245
Right-of-use assets 7,890 20,294
Restructuring expenses 4,977 6,857
Depreciation 2,464 1,617
Unrealized transactions   990
Other 6,266 6,038
Total deferred tax liabilities 640,294 672,041
Less: deferred income tax asset valuation allowances (6,706) (5,570)
Net deferred tax liabilities 489,054 506,135
Noncurrent deferred tax asset 2,188 227
Noncurrent deferred tax liability $ 491,242 $ 506,362