Goodwill And Other Intangible Assets (Rollforward of Other Intangible Assets) (Detail) (USD $)	9 Months Ended		9 Months Ended	3 Months Ended		9 Months Ended				9 Months Ended					9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Accumulated Translation Adjustment [Member] Intangible Assets Excluding Goodwill [Member]	Sep. 30, 2013 Continuing Operations [Member]	Sep. 30, 2012 Continuing Operations [Member]	Sep. 30, 2013 Continuing Operations [Member]	Sep. 30, 2012 Continuing Operations [Member]	Sep. 30, 2013 Customer Relationships and Backlog [Member]	Dec. 31, 2012 Customer Relationships and Backlog [Member]	Sep. 30, 2013 Customer Relationships and Backlog [Member] Continuing Operations [Member]	Sep. 30, 2013 Other Finite-Lived Intangible Assets [Member]		Dec. 31, 2012 Other Finite-Lived Intangible Assets [Member]		Sep. 30, 2013 Other Finite-Lived Intangible Assets [Member] Continuing Operations [Member]		Sep. 30, 2013 Trade Names [Member]	Sep. 30, 2013 Pre-Qualifications [Member]
Intangible Assets [Line Items]
Other intangible assets, non-amortizing																	$ 34,800,000	$ 60,200,000
Gross carrying amount, amortizing intangible assets									109,600,000				19,800,000	[1]
Gross carrying amount, other intangible assets		195,500,000
Accumulated amortization, amortizing intangible assets		(58,500,000)							(48,200,000)				(10,300,000)	[1]
Other Intangible Assets [Roll Forward]
Other intangible assets, non-amortizing, beginning balance																	34,800,000	31,300,000
Additions from new business combinations, other non-amortizing intangible assets																	0	29,600,000
Currency translation adjustments, other non-amortizing intangible assets																	0	(700,000)
Other intangible assets, non-amortizing,ending balance																	34,800,000	60,200,000
Other intangible assets, amortizing, net, beginning balance								61,400,000			9,500,000	[1]
Additions from new business combinations, amortizing intangible assets								19,900,000			2,500,000	[1]
Amortization of intangible assets				(5,800,000)	(2,800,000)	(15,200,000)	(8,500,000)			(14,400,000)					(800,000)	[1]
Currency translation adjustments, amortizing intangible assets								(300,000)			0	[1]
Other intangible assets, amortizing, net, ending balance								66,600,000			11,200,000	[1]
Other intangible assets, net, beginning balance	137,020,000
Additions from new business combinations, other intangible assets	52,000,000
Currency translation adjustments, other intangible assets			(1,000,000)
Other intangible assets, net, ending balance	$ 172,833,000

[1] Consists principally of trade names and non-compete agreements.