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Debt Agreements - 2027 Senior Notes - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jul. 16, 2019
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]      
Senior notes   $ 2,546,837 $ 2,555,233
Outstanding principal amount $ 625,000 $ 2,590,026 $ 2,606,026
Senior Secured Term Loan [Member]      
Debt Instrument [Line Items]      
Outstanding principal amount $ 100,000    
2027 Senior Notes [Member]      
Debt Instrument [Line Items]      
Interest rate 5.50% 5.50%  
Cash on hand $ 65,000    
Debt instrument, frequency of periodic payment   semiannually  
Debt instrument redemption description   Some or all of the 2027 Senior Notes may be redeemed at any time at specified redemption prices, plus accrued and unpaid interest to the redemption date. In addition, the 2027 Senior Notes may be redeemed in whole but not in part at a redemption price equal to 100% of the principal amount plus accrued and unpaid interest and additional amounts, if any, to, but excluding, the redemption date, if on the next date on which any amount would be payable in respect of the 2027 Senior Notes, HTUSA or any guarantor is or would be required to pay additional amounts as a result of certain tax related events.  
Debt instrument, effective interest rate   5.76%  
Debt instrument, fair value   $ 616,500  
2023 Senior Notes [Member]      
Debt Instrument [Line Items]      
Interest rate 6.625%    
Outstanding principal amount $ 225,000    
2024 Senior Notes [Member]      
Debt Instrument [Line Items]      
Interest rate 8.75%    
Outstanding principal amount $ 300,000    
Horizon Pharma USA Inc [Member] | 2027 Senior Notes [Member]      
Debt Instrument [Line Items]      
Senior notes $ 600,000    
Interest rate 5.50%    
Maturity date of debt instrument Aug. 01, 2027    
Debt instrument redemption description   If the Company undergoes a change of control, HTUSA will be required to make an offer to purchase all of the 2027 Senior Notes at a price in cash equal to 101% of the aggregate principal amount thereof plus accrued and unpaid interest to, but not including, the repurchase date, subject to certain exceptions. If the Company or certain of its subsidiaries engages in certain asset sales, HTUSA will be required under certain circumstances to make an offer to purchase the 2027 Senior Notes at 100% of the principal amount thereof, plus accrued and unpaid interest to the repurchase date  
Redemption price percentage of principal amount of debt instrument on change of control 101.00%