Revenue by Geographic Region (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Segment Reporting Information [Line Items]
Revenue	$ 194,441		$ 200,058		$ 392,590		$ 412,044
United States
Segment Reporting Information [Line Items]
Revenue	121,810	[1]	123,767	[1]	245,166	[1]	252,846	[1]
International
Segment Reporting Information [Line Items]
Revenue	$ 72,631	[1]	$ 76,291	[1]	$ 147,424	[1]	$ 159,198	[1]

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