Revenues Based on Domicile of Company's Customers (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Segment Reporting Information [Line Items]
Total revenues	$ 478,443		$ 462,651		$ 943,439		$ 923,813
United States
Segment Reporting Information [Line Items]
Total revenues	313,300		303,800		618,100		609,300
Europe
Segment Reporting Information [Line Items]
Total revenues	70,200	[1]	73,900	[1]	141,100	[1]	146,800	[1]
Canada
Segment Reporting Information [Line Items]
Total revenues	61,000		51,000		117,800		101,800
Japan
Segment Reporting Information [Line Items]
Total revenues	16,800	[1]	19,500	[1]	33,200	[1]	37,900	[1]
Mexico
Segment Reporting Information [Line Items]
Total revenues	4,200		2,700		8,300		5,100
Other
Segment Reporting Information [Line Items]
Total revenues	$ 12,900	[1]	$ 11,800	[1]	$ 24,900	[1]	$ 22,900	[1]

[1] Revenues are impacted by movements in foreign currency exchange rates.