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Expiration of Loss and Tax Credit Carryforwards (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Operating Loss and Tax Credit Carryforward [Line Items]
Loss carryforwards	$ 445,800
Tax credit carryforwards	77,400
Period of Expiration 2014 - 2018
Operating Loss and Tax Credit Carryforward [Line Items]
Loss carryforwards	60,363
Tax credit carryforwards	27,678
Period of Expiration Thereafter
Operating Loss and Tax Credit Carryforward [Line Items]
Loss carryforwards	180,756
Tax credit carryforwards	43,502
No Expiration Date
Operating Loss and Tax Credit Carryforward [Line Items]
Loss carryforwards	204,681
Tax credit carryforwards	$ 6,220