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Goodwill and Other Intangible Assets, net - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2018	Dec. 31, 2022	Oct. 01, 2020	Jul. 13, 2017	Jun. 15, 2015
Goodwill and Intangible Assets [Line Items]
Goodwill	$ 27,210,000		$ 27,210,000		$ 27,210,000
Amortization expense	657,000	$ 693,000	2,043,000	$ 2,079,000
Data and Analytics Services [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill	$ 18,783,000		18,783,000		18,783,000		$ 24,083,000
Goodwill impairment			$ 0		$ 5,300,000
Hudson IT [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill										$ 8,400,000
Info Trellis Inc [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill									$ 27,400,000
Goodwill impairment						$ 9,700,000
Amber Leaf Partners Inc [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill								$ 6,400,000

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Goodwill And Intangible Assets [Line Items]

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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