Special Charges for Restructuring Activities - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Restructuring Cost and Reserve [Line Items]
Special charges for restructuring activities	$ 17,470,000	$ 12,232,000	$ 20,128,000	$ 20,655,000
Employee termination benefits			16,300,000
Consulting and administrative costs			200,000
Global Competitiveness Initiative [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination benefits			200,000	15,100,000
Facility consolidation			2,200,000	5,600,000
Business Optimization Project [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination benefits			8,500,000
Facility consolidation			200,000
Special charges for restructuring activities			9,400,000
Consulting and administrative costs			700,000
mPower Program Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination benefits			5,700,000
Facility consolidation			200,000
Special charges for restructuring activities			7,900,000
Consulting and administrative costs			2,000,000
Technical Services Segment Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Employee termination benefits			$ 400,000