Summary of Significant Accounting Policies - Additional Information1 (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Summary of Significant Accounting Policies [Line Items]
Net income	$ 102,519	$ 90,695	$ 91,319	$ 76,097	$ 193,214	$ 167,416
Diluted earnings per share	$ 3.83		$ 3.42		$ 7.21	$ 6.27
Property and Equipment [Member]
Summary of Significant Accounting Policies [Line Items]
Income loss from continuing operations	$ 2,000				$ 2,000
Net income	$ 1,500				$ 1,500
Maximum [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-07-01
Summary of Significant Accounting Policies [Line Items]
Payment terms	30 days				30 days
Maximum [Member] | Property and Equipment [Member]
Summary of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	20 years				20 years
Minimum [Member] | Property and Equipment [Member]
Summary of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	14 years				14 years