Income Taxes - Earnings Before Income Taxes (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
Components Of Earnings From Continuing Operations Before Income Taxes And Provision For Income Taxes [Line Items]
U.S.									$ 99,970	$ 87,436	$ 71,271
Foreign									44,698	54,253	43,903
Earnings before income taxes	$ 34,775	$ 28,703	$ 54,187	$ 27,003	$ 41,155	$ 25,614	$ 53,447	$ 21,473	$ 144,668	$ 141,689	$ 115,174