Summary of Significant Accounting Policies - Additional Information1 (Detail) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Summary of Significant Accounting Policies [Line Items]
Net income	$ 92,748	$ 102,519	$ 90,695	$ 98,213	$ 91,319	$ 76,097	$ 285,962	$ 265,629
Property and Equipment [Member]
Summary of Significant Accounting Policies [Line Items]
Income loss from continuing operations	2,800						4,900
Net income	$ 2,100						$ 3,700
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