Changes in Liability for Unrecognized Gross Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Contingency [Line Items]
Uncertain tax positions at beginning of year	$ 24,220	$ 8,922	$ 13,068
Additions for tax positions relating to current-year operations	2,436	4,365	457
Additions for tax positions relating to prior tax years	6,218	11,890
Subtractions for tax positions relating to prior tax years	(3,641)	(457)	(4,603)
Reductions in balance due to settlements	(8,983)	(500)
Uncertain tax positions at end of year	$ 20,250	$ 24,220	$ 8,922