Exit and Termination Costs - Exit and Termination Costs Included in Accrued Liabilities in Consolidated Balance Sheet - (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Exit costs included in accrued liabilities in consolidated balance sheet
Accrued severance costs	$ 567	$ 5,909	$ 7,535
Exit Costs
Exit costs included in accrued liabilities in consolidated balance sheet
Beginning balance	493,543	0
Accrued severance costs	0	0
Accrued contract obligations	27,575	490,114
Accretion of discount	48,669	20,720
Payments	(90,895)	(17,291)
Ending balance	423,742	493,543	0
Termination Costs
Exit costs included in accrued liabilities in consolidated balance sheet
Beginning balance	1,454	4,692
Accrued severance costs	567	5,909
Accrued contract obligations	0	0
Accretion of discount	0	0
Payments	(2,011)	(9,147)
Ending balance	$ 10	$ 1,454	$ 4,692