Schedule II Valuation and Qualifying Accounts (Detail) (Valuation Allowance of Deferred Tax Assets [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 78,590	$ 80,465	$ 68,346
Additions charged to costs and expenses	17,624	10,273	13,689
Write-offs and provision reduction	(388)	(12,148)	(1,570)
Balance at end of year	$ 95,826	$ 78,590	$ 80,465