Revenue by Geographic Region (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]
Revenue	$ 200,058		$ 224,577		$ 412,044		$ 458,327
United States
Segment Reporting Information [Line Items]
Revenue	123,767	[1]	129,840	[1]	252,846	[1]	263,169	[1]
International
Segment Reporting Information [Line Items]
Revenue	$ 76,291	[1]	$ 94,737	[1]	$ 159,198	[1]	$ 195,158	[1]

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