Telford Acquisition - Additional Information (Detail) £ / shares in Units, $ in Thousands, £ in Millions		12 Months Ended
	Oct. 01, 2019 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Oct. 01, 2019 GBP (£) £ / shares
Business Acquisition [Line Items]
Revenue		$ 23,894,091	$ 21,340,088	$ 18,628,787
Operating income		1,259,875	1,087,989	1,078,682
Operational net income		1,361,345	1,379,006	1,171,333
Direct transaction and integration costs		15,292	9,124	$ 27,351
Telford Homes Plc [Member]
Business Acquisition [Line Items]
Date of business purchase agreement	Oct. 01, 2019
Share price | £ / shares					£ 3.50
Business combination, cash consideration	$ 328,500				£ 267.1
Revenue		97,500
Operating income		1,000
Operational net income		1,400
Direct transaction and integration costs		15,000
Amortization expense		400
Increased amortization expense		1,000	1,500
Increased interest expense			$ 4,100
Removal of direct costs		$ 15,000