Acquisitions, Divestitures and Other Arrangements - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Goodwill	$ 1,010,538	$ 1,066,709
Viela Bio [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Deferred tax liabilities, net	(451,300)
Viela Bio [Member] | Before [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Deferred tax liabilities, net	(457,928)
Accrued expenses and other current liabilities	(73,401)
Other long-term liabilities	(22,631)
Accounts payable	(4,768)
Accrued trade discounts and rebates	(1,492)
Marketable securities	400
Property, plant and equipment	1,747
Other assets	3,253
Accounts receivable	8,053
Prepaid expenses and other current assets	16,444
Inventories	149,348
Cash and cash equivalents	342,347
In-process research and development	910,000
Developed technology	1,460,000
(Liabilities assumed) and assets acquired	2,331,372
Goodwill	662,719
Fair value of consideration paid	2,994,091
Viela Bio [Member] | Adjustments [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Deferred tax liabilities, net	6,589
Accrued expenses and other current liabilities	(335)
Accrued trade discounts and rebates	(373)
Other assets	1,613
Accounts receivable	(267)
Prepaid expenses and other current assets	152
Inventories	2,300
(Liabilities assumed) and assets acquired	9,679
Goodwill	(9,679)
Viela Bio [Member] | After [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Deferred tax liabilities, net	(451,339)
Accrued expenses and other current liabilities	(73,736)
Other long-term liabilities	(22,631)
Accounts payable	(4,768)
Accrued trade discounts and rebates	(1,865)
Marketable securities	400
Property, plant and equipment	1,747
Other assets	4,866
Accounts receivable	7,786
Prepaid expenses and other current assets	16,596
Inventories	151,648
Cash and cash equivalents	342,347
In-process research and development	910,000
Developed technology	1,460,000
(Liabilities assumed) and assets acquired	2,341,051
Goodwill	653,040
Fair value of consideration paid	$ 2,994,091