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Goodwill - Summary of Key Assumptions Used in the Discounted Cash Flow Analyses (Detail)	3 Months Ended			12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2024
Minimum [Member]
Goodwill [Line Items]
Operating income margins	19.70%	19.70%	19.70%
Maximum [Member]
Goodwill [Line Items]
Operating income margins	28.60%	29.90%	30.40%
Measurement Input, Long-term Revenue Growth Rate [Member] | Minimum [Member]
Goodwill [Line Items]
Revenue growth rates	(10.70%)	(16.50%)	(1.20%)
Measurement Input, Long-term Revenue Growth Rate [Member] | Maximum [Member]
Goodwill [Line Items]
Revenue growth rates	6.10%	24.40%	1.80%
Measurement Input, Discount Rate [Member]
Goodwill [Line Items]
Revenue growth rates	9.00%	10.00%	10.00%
Philadelphia, PA Market Cluster [Member] | Goodwill [Member]
Goodwill [Line Items]
Operating income margins				27.90%
Philadelphia, PA Market Cluster [Member] | Goodwill [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Minimum [Member]
Goodwill [Line Items]
Revenue growth rates				(9.30%)
Philadelphia, PA Market Cluster [Member] | Goodwill [Member] | Measurement Input, Long-term Revenue Growth Rate [Member] | Maximum [Member]
Goodwill [Line Items]
Revenue growth rates				1.40%
Philadelphia, PA Market Cluster [Member] | Goodwill [Member] | Measurement Input, Discount Rate [Member]
Goodwill [Line Items]
Revenue growth rates				10.00%

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