Accounts Receivable, Net Of Allowance (Schedule Of Accounts Receivable) (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contract billings	$ 606,500,000	$ 522,000,000
Retainage	159,300,000	113,500,000
Costs and earnings in excess of billings	384,600,000	253,000,000
Accounts receivable, gross	1,150,400,000	888,500,000
Accounts receivable, net	1,134,337,000	877,214,000
Continuing Operations [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less allowance for doubtful accounts	$ (16,100,000)	$ (11,300,000)	$ (7,700,000)