Actual Cash and Non-Cash Charges of the Restructuring Plan (Detail) (2011 Restructuring Plan, USD $) In Thousands, unless otherwise specified	12 Months Ended			26 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Total restructuring costs	$ 2,283	$ 6,057	$ 1,967
Cumulative Costs				10,307
Cash Charges
Restructuring Cost and Reserve [Line Items]
Total restructuring costs	1,692	4,109	1,061
Cumulative Costs				6,862
Non-Cash Charges
Restructuring Cost and Reserve [Line Items]
Total restructuring costs	591	1,948	906
Cumulative Costs				$ 3,445