Discontinued Operations (Summary of Assets and Liabilities) (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets	$ 2.3	$ 18.6	$ 30.6
Long-term assets	10.1	7.6	121.7
Globetec [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets		18.6
Long-term assets		7.7
Assets of discontinued operations		26.3
Current liabilities of discontinued operations		10.7
Globetec [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets	2.3
Long-term assets	10.1
Assets of discontinued operations	12.4
Current liabilities of discontinued operations	$ 1.2