Income Taxes - Summary of Net Operating Loss and Tax Credit Carryforwards (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
State [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, amount	$ 340,766
Tax credit carryforward, amount	$ 78,035
State [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration year	2017
Tax credit carryforward, expiration year	2019
State [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration year	2036
Tax credit carryforward, expiration	indefinite
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, amount	$ 9,552
Tax credit carryforward, amount	$ 548
Tax credit carryforward, expiration	indefinite
Foreign [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration year	2033
Foreign [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration	indefinite
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, amount	$ 427,475
Tax credit carryforward, amount	$ 86,116
Federal [Member] | Earliest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration year	2027
Tax credit carryforward, expiration year	2030
Federal [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards, expiration year	2036
Tax credit carryforward, expiration year	2036