Revenue by Geographic Region (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Segment Reporting Information [Line Items]
Revenue	$ 196,817		$ 220,821		$ 608,861		$ 679,148
United States
Segment Reporting Information [Line Items]
Revenue	123,519	[1]	129,182	[1]	376,365	[1]	392,351	[1]
International
Segment Reporting Information [Line Items]
Revenue	$ 73,298	[1]	$ 91,639	[1]	$ 232,496	[1]	$ 286,797	[1]

[1] Revenue by geographic region is generally based on the location of the Company's subsidiary.