Acquisitions (Schedule of Finite-Lived Intangible Assets Acquired, Business Acquisitions - Big Country) (Details) - May. 01, 2013 - Big Country [Member] - USD ($) $ in Millions	Total
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, weighted average useful life (in years)	6 years
Backlog [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, weighted average useful life (in years)	3 years
Non-Compete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, weighted average useful life (in years)	9 years
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, weighted average useful life (in years)	7 years
Canadian Dollars [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets (in dollars)	$ 10.7
Canadian Dollars [Member] | Backlog [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets (in dollars)	1.9
Canadian Dollars [Member] | Non-Compete Agreements [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets (in dollars)	1.8
Canadian Dollars [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets (in dollars)	$ 7.0