Rationalization Charges According to Plans (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Cost and Reserve [Line Items]
Rationalization charges	$ 2,900	$ 2,000	$ 200	$ 3,600	$ 2,900	$ 600	$ 2,400	$ 1,700	$ 8,660	$ 7,717	$ 22,214
2012 Rationalization Plans
Restructuring Cost and Reserve [Line Items]
Rationalization charges									7,204
2011 Rationalization plans
Restructuring Cost and Reserve [Line Items]
Rationalization charges									389	1,925
2010 Rationalization plans
Restructuring Cost and Reserve [Line Items]
Rationalization charges									1,067	4,404	21,439
2009 and Prior Years' Rationalization Plans
Restructuring Cost and Reserve [Line Items]
Rationalization charges										$ 1,388	$ 775