Acquisitions (Details) - USD ($) $ in Thousands	Feb. 01, 2024	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Recognized amounts of identifiable assets acquired and liabilities assumed:
Goodwill		$ 862,934	$ 666,834	$ 611,789
Summit Texas
Consideration transferred:
Cash paid at closing	$ 267,500
Working capital adjustment	14,595
Notes issued to former owners	35,000
Estimated fair value of contingent earn-out payments	42,732
Consideration transferred	359,827
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash and cash equivalents	171,027
Billed and unbilled accounts receivable	59,921
Prepaid expenses and other	1,476
Cost and estimated earnings in excess of billings	578
Property and equipment	2,528
Lease right-of-use asset	2,365
Goodwill	155,220
Identifiable intangible assets	170,100
Other noncurrent assets	136
Accounts payable	(15,138)
Billings in excess of costs and estimated earnings	(179,895)
Current operating lease liabilities	(1,495)
Accrued expenses and other current liabilities	(6,243)
Long-term operating lease liabilities	(753)
Total assets acquired and liabilities assumed	359,827
J&S West Jordan
Consideration transferred:
Cash paid at closing	100,000
Working capital adjustment	1,531
Notes issued to former owners	10,000
Estimated fair value of contingent earn-out payments	9,052
Consideration transferred	120,583
Recognized amounts of identifiable assets acquired and liabilities assumed:
Cash and cash equivalents	14,802
Billed and unbilled accounts receivable	38,411
Inventory	230
Prepaid expenses and other	326
Cost and estimated earnings in excess of billings	728
Property and equipment	2,674
Lease right-of-use asset	4,552
Goodwill	40,680
Identifiable intangible assets	63,300
Other noncurrent assets	10
Accounts payable	(20,612)
Billings in excess of costs and estimated earnings	(19,188)
Current operating lease liabilities	(133)
Accrued expenses and other current liabilities	(826)
Long-term debt	(59)
Long-term operating lease liabilities	(4,312)
Total assets acquired and liabilities assumed	$ 120,583