Restructuring and Other Charges - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013
Restructuring Cost and Reserve [Line Items]
Number of reportable business segments		3
Cash payments		$ 3.8
Workforce Restructurings and Other
Restructuring Cost and Reserve [Line Items]
Accrued future employee-related cost	9.5
Cash payments	0	3.5
Expected employee-related cost	2
Expected completion date description	The Company expects that substantially all amounts will be paid by the end of the first quarter of 2014, although benefit payments to certain employees will extend over a period of time up to one year from the termination date
Pinnacle Assets
Restructuring Cost and Reserve [Line Items]
Expected completion date description		Integration of the Pinnacle assets, which we expect to complete in the first half of 2014
Expected future cash charges related to the integration of the Pinnacle assets	$ 3	$ 3