Discontinued Operations (Results of Operations from Discontinued Operations) (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on disposal and impairment charges, before tax									$ (6,036,000)	$ (12,922,000)	$ 0
Benefit from income taxes									2,400,000	4,500,000	(6,200,000)
Net loss from discontinued operations	(1,300,000)	(3,700,000)	(500,000)	(900,000)	(1,400,000)	(9,300,000)	(1,100,000)	2,500,000	(6,456,000)	(9,223,000)	8,516,000
Globetec [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue									18,000,000	18,800,000	29,200,000
Loss from operations, before tax									(2,900,000)	(7,000,000)	(7,400,000)
Loss on disposal and impairment charges, before tax									(6,000,000)	(12,700,000)	0
Benefit from income taxes									2,400,000	6,800,000	2,200,000
Net loss from discontinued operations									$ (6,500,000)	$ (12,900,000)	$ (5,200,000)