Commitments and Contingent Liabilities - Additional Information (Detail) (USD $)	12 Months Ended				12 Months Ended							1 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Discontinued Operations	Dec. 31, 2013 Minimum	Dec. 31, 2013 Maximum	Dec. 31, 2013 Accrued Liabilities	Dec. 31, 2012 Accrued Liabilities	Dec. 31, 2013 Other Liability	Dec. 31, 2012 Other Liability	Dec. 31, 2013 Property, Plant and Equipment	Aug. 31, 2013 Property, Plant and Equipment Build To Suit Lease	Dec. 31, 2013 Property, Plant and Equipment Build To Suit Lease	Dec. 31, 2013 Property, Plant and Equipment Build To Suit Lease Corporate Headquarters
Loss Contingencies [Line Items]
Estimated fair value of the costs to construct buildings	$ 55,092,000	$ 41,424,000									$ 13,600,000	$ 23,000,000	$ 11,200,000	$ 9,600,000
Expected construction completion year												2014-10		2014-02
Lease commencement date														Feb. 01, 2014
Operating leases, rental expense	26,400,000	24,000,000	26,300,000
Waste disposed accrued liability							2,500,000	1,900,000	5,800,000	6,900,000
Time-frame over which the accrued amounts may be paid out, in years					15 years	20 years
Contingency reserve for litigation	$ 6,800,000	$ 2,300,000		$ 1,400,000