Business Acquisitions - Summary of Assets Acquired and Liabilities Assumed - Drum Acquisition (Detail) - USD ($) $ in Thousands	7 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Aug. 27, 2021
Fair Values of Assets Acquired and Liabilities Assumed
Goodwill	$ 1,773,671	$ 1,781,332
Drum
Fair Values of Assets Acquired and Liabilities Assumed
Cash and cash equivalents	1,900		$ 1,900
Accounts receivable	60,500		69,100
Contract assets	47,500		40,100
Income taxes receivable, net	700		700
Right of use assets under operating leases	1,500		1,500
Prepaid expenses	5,200		5,200
Property and equipment	119,300		118,100
Intangible assets	303,500		335,000
Goodwill	448,900		446,800
Total assets acquired	989,000		1,018,400
Trade and other payables	46,200		46,200
Finance lease obligations	28,700		27,500
Contract liabilities	12,700		12,700
Operating lease obligations	1,500		1,500
Other liabilities	4,400		5,300
Deferred tax liabilities	71,400		94,800
Total liabilities assumed and noncontrolling interest	164,900		188,000
Net assets acquired	824,100		$ 830,400
Measurement Period Adjustments, Accounts receivable	(8,600)
Measurement Period Adjustments, Contract assets	7,400
Measurement Period Adjustments, Property and equipment	1,200
Measurement Period Adjustments, Intangible assets	(31,500)
Measurement Period Adjustments, Goodwill	2,100
Measurement Period Adjustments, Total assets	(29,400)
Measurement Period Adjustments, Finance lease obligations	1,200
Measurement Period Adjustments, Other liabilities	(900)
Measurement Period Adjustments, Deferred tax liabilities	(23,400)
Measurement Period Adjustments, Total liabilities	(23,100)
Measurement Period Adjustments, Net assets acquired	$ (6,300)