Option and Restricted Stock Activity (Detail) (USD $)	1 Months Ended	6 Months Ended
	Jan. 31, 2013	Jun. 30, 2013
Options Outstanding, Number of Shares
Shares and Units Available for Grant, Beginning balance	4,024,000	4,024,000
Additional shares reserved under the 2012 equity incentive plan	3,000,000.0	3,025,000
Shares and Units Available for Grant, Granted		(3,910,000)
Shares and Units Available for Grant, Options exercised/ Restricted stock released		0
Options Outstanding, Number of Shares, Canceled /Forfeited		4,469,000
Shares and Units Available for Grant, Ending balance		7,608,000
Stock Options
Options Outstanding, Number of Shares
Options Outstanding, Number of Shares, Beginning Balance	15,189,000	15,189,000
Additional shares reserved under the 2012 equity incentive plan		0
Options Outstanding, Number of Shares, Granted		2,093,000
Options Outstanding, Number of Shares, Options exercised/ Restricted stock released		(2,951,000)
Options Outstanding, Number of Shares, Canceled /Forfeited		3,793,000
Options Outstanding, Number of Shares, Ending Balance		10,538,000
Options Outstanding, Options, Weighted Average Exercise Price
Options Outstanding, Weighted Average Exercise Price, Beginning Balance	$ 6.98	$ 6.98
Options Outstanding, Weighted Average Exercise Price, Grants in Period		$ 7.05
Options Outstanding, Weighted Average Exercise Price, Options exercised/ Restricted stock released in Period		$ 7.36
Options Outstanding, Weighted Average Exercise Price, Forfeitures in Period		$ 6.65
Options Outstanding, Weighted Average Exercise Price, Ending Balance		$ 5.30
Restricted Stock Outstanding
Options Outstanding, Number of Shares
Restricted Stock Outstanding Number of Share, Beginning balance	3,928,000	3,928,000
Additional shares reserved under the 2012 equity incentive plan		0
Restricted Stock Outstanding Number of Share, Granted		1,817,000
Restricted Stock Outstanding Number of Share, Options exercised/ Restricted stock released		(405,000)
Restricted Stock Outstanding Number of Share, Canceled /Forfeited		(676,000)
Restricted Stock Outstanding Number of Share, Ending balance		4,664,000