Acquisitions and Divestitures - Additional Information (Detail) (USD $)	0 Months Ended	9 Months Ended	0 Months Ended		3 Months Ended	9 Months Ended
	Aug. 15, 2014	Sep. 30, 2014 JointVentures	Jul. 01, 2014 Texas Industries Inc.	Jan. 27, 2014 Texas Industries Inc.	Sep. 30, 2014 Texas Industries Inc.	Sep. 30, 2014 Texas Industries Inc.	Jul. 01, 2014 Texas Industries Inc.
Acquisitions And Divestitures [Line Items]
Number of shares issued per single share				0.70
Common shares issued to former shareholders				20,309,000
Stock price							$ 132.00
Aggregate value of common shares issued to former shareholders							$ 2,680,788,000
Stock options and stock appreciation rights converted into stock awards			71,085,000
Total consideration transferred					2,756,934,000	2,756,934,000	2,756,934,000
Total revenue from operations included in the consolidated earnings statements						287,587,000
Total revenue from operations included in the consolidated earnings statements						18,755,000
Business development expenses					73,968,000	73,968,000
Acquisition integration expenses					88,959,000	88,959,000
Pretax gain on divestiture of business	47,904,000
Payment to acquire the remaining interest in the joint ventures		$ 19,480,000
Number of joint ventures		2