Revenues Generated in Domestic and Foreign Country (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Net revenue	$ 520,972	$ 520,741	$ 483,712	$ 384,987	$ 445,077	$ 418,529	$ 404,883	$ 366,417	$ 1,910,412	$ 1,634,906	$ 1,672,390
United States
Segment Reporting Information [Line Items]
Net revenue									1,791,316	1,515,378	1,564,057
International
Segment Reporting Information [Line Items]
Net revenue									$ 119,096	$ 119,528	$ 108,333