Intangible Assets (Detail) (USD $)	6 Months Ended
	Jun. 30, 2013	May 08, 2012
Acquired Finite and Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible assets purchase price allocation		$ 162,800,000
Backlog
Acquired Finite and Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible assets preliminarily, Amount		900,000
Backlog | Maximum
Acquired Finite and Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible assets preliminarily, UsefulLife	1 year
Tradenames and Trademarks
Acquired Finite and Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible assets preliminarily, Amount		27,600,000
Intangible assets preliminarily, UsefulLife	20 years
Technology
Acquired Finite and Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible assets preliminarily, Amount		15,300,000
Intangible assets preliminarily, UsefulLife	12 years
Customer relationships
Acquired Finite and Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible assets preliminarily, Amount		$ 119,000,000
Intangible assets preliminarily, UsefulLife	10 years