Revenue by Geographic Region (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Segment Reporting Information [Line Items]
Revenue	$ 191,220		$ 196,817		$ 583,810		$ 608,861
United States
Segment Reporting Information [Line Items]
Revenue	120,671	[1]	123,519	[1]	365,837	[1]	376,365	[1]
International
Segment Reporting Information [Line Items]
Revenue	$ 70,549	[1]	$ 73,298	[1]	$ 217,973	[1]	$ 232,496	[1]

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