Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Income Tax Contingency [Line Items]
Unrecognized tax benefits balance at January 1	$ 727,367	$ 532,862
Gross increase for tax positions of prior years	69,188	9,441
Gross decrease for tax positions of prior years	(40,298)	(32,513)
Gross increase for tax positions of current year	34,556	231,525
Settlements	(94,640)	(10,520)
Lapse of statute of limitations	(888)	(3,428)
Unrecognized tax benefits balance at December 31	$ 695,285	$ 727,367