Estimated Net Operating Loss Carryforwards And Research and Development Credit Carryforwards for Federal and State Tax Reporting Purposes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Operating Loss Carryforwards And Research And Development Credit Carryforwards [Line Items]
Net operating loss carryforwards, federal	$ 498,728
Net operating loss carryforwards, state	90,329
Net operating loss carryforwards, Foreign	122,031
Federal
Operating Loss Carryforwards And Research And Development Credit Carryforwards [Line Items]
Research and development credit carryforwards	25,882
State
Operating Loss Carryforwards And Research And Development Credit Carryforwards [Line Items]
Research and development credit carryforwards	$ 4,388
Operating loss expiration date	2033
Foreign
Operating Loss Carryforwards And Research And Development Credit Carryforwards [Line Items]
Operating loss expiration date	2021
Minimum | Federal
Operating Loss Carryforwards And Research And Development Credit Carryforwards [Line Items]
Operating loss expiration date	2024
Research and development credit carryforwards expiration date	2018
Minimum | State
Operating Loss Carryforwards And Research And Development Credit Carryforwards [Line Items]
Research and development credit carryforwards expiration date	2005
Maximum | Federal
Operating Loss Carryforwards And Research And Development Credit Carryforwards [Line Items]
Operating loss expiration date	2033
Research and development credit carryforwards expiration date	2033
Maximum | State
Operating Loss Carryforwards And Research And Development Credit Carryforwards [Line Items]
Research and development credit carryforwards expiration date	2028