Restructuring - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring expenses related to restructuring initiative	$ 0	$ 32,473	$ 12,314
2011 restructuring initiative
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring expenses related to restructuring initiative	0	32,473	12,314
Number of employees	491	292
Restructuring liabilities	$ 0	$ 10,887	$ 5,875