Estimated Net Operating Loss Carryforwards And Research and Development Credit Carryforwards for Federal and State Tax Reporting Purposes (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Operating Loss Carryforwards And Research And Development Credit Carryforwards [Line Items]
Net operating loss carryforwards, federal	$ 661,063
Net operating loss carryforwards, state	292,111
Net operating loss carryforwards, Foreign	266,024
Federal
Operating Loss Carryforwards And Research And Development Credit Carryforwards [Line Items]
Research and development credit carryforwards	32,348
State
Operating Loss Carryforwards And Research And Development Credit Carryforwards [Line Items]
Research and development credit carryforwards	$ 6,718
Minimum | Federal
Operating Loss Carryforwards And Research And Development Credit Carryforwards [Line Items]
Operating loss expiration date	2020
Research and development credit carryforwards expiration date	2019
Minimum | State
Operating Loss Carryforwards And Research And Development Credit Carryforwards [Line Items]
Operating loss expiration date	2020
Research and development credit carryforwards expiration date	2020
Minimum | Foreign
Operating Loss Carryforwards And Research And Development Credit Carryforwards [Line Items]
Operating loss expiration date	2020
Maximum | Federal
Operating Loss Carryforwards And Research And Development Credit Carryforwards [Line Items]
Operating loss expiration date	2036
Research and development credit carryforwards expiration date	2036
Maximum | State
Operating Loss Carryforwards And Research And Development Credit Carryforwards [Line Items]
Operating loss expiration date	2036
Research and development credit carryforwards expiration date	2036
Maximum | Foreign
Operating Loss Carryforwards And Research And Development Credit Carryforwards [Line Items]
Operating loss expiration date	2022