Lease Obligations - Additional Information (Detail) $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 31, 2022	Mar. 31, 2022 USD ($) ft²	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Apr. 01, 2022 ft²	Nov. 30, 2021 ft²
Lessee Lease Description [Line Items]
Right-of-use assets		$ 95.2		$ 75.7
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]		Other assets		Other assets
Lease liability, current		$ 4.8		$ 3.6
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]		http://fasb.org/us-gaap/2021-01-31#AccruedLiabilitiesCurrent		http://fasb.org/us-gaap/2021-01-31#AccruedLiabilitiesCurrent
Lease liability, noncurrent		$ 111.5		$ 93.8
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]		Other long-term liabilities		Other long-term liabilities
Rent expense		$ 3.0	$ 1.6
Weighted-average discount rate		4.52%
Weighted-average remaining lease term		14 years 1 month 13 days
Rockville Maryland Office [Member]
Lessee Lease Description [Line Items]
Office space | ft²		24,500				192,000
Rockville Maryland Office [Member] | Subsequent Event [Member]
Lessee Lease Description [Line Items]
Office space | ft²					14,000
Rockville Maryland Office [Member] | Second Lease [Member]
Lessee Lease Description [Line Items]
Office space | ft²		3,600
Lake Forest Office [Member]
Lessee Lease Description [Line Items]
Office space | ft²		160,000
Impairment charges		$ 12.4
Sublease agreement entered date	2022-01
Lease expiry date	Mar. 31, 2031	Mar. 31, 2031