Employee Benefit Plans - Summary of Company's Stock Option and Restricted Stock Unit Activity (Detail) shares in Thousands	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Available for Grant, Beginning balance	7,480
Shares Available for Grant, Authorized	350
Number of Shares, Granted, Shares Available for Grant	(4,471)
Number of Shares, Forfeited or Canceled, Options and Other than Options	2,791
Shares Available for Grant, Ending balance	6,150
Stock Options Outstanding [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Beginning balance	7,255
Number of Shares, Authorized	0
Number of Shares, Granted	1,378
Number of Shares, Options exercised	(750)
Number of Shares, Forfeited or cancelled	(2,209)
Number of Shares, Ending balance	5,674
Weighted Average Exercise Price, Beginning balance | $ / shares	$ 6.65
Weighted Average Exercise Price, Granted | $ / shares	7.29
Weighted Average Exercise Price, Options exercised | $ / shares	5.31
Weighted Average Exercise Price, Forfeited or cancelled | $ / shares	7.73
Weighted Average Exercise Price, Ending balance | $ / shares	$ 6.56
Restricted Stock Units Outstanding [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Authorized	0
Number of Units, Beginning balance	2,241
Number of Units, Granted	2,062
Number of Units, Exercised	0
Number of Units, Shares released	(1,721)
Number of Units, Forfeited or cancelled	(400)
Number of Units, Ending balance	2,182
Weighted Average Grant Date Fair Value, Beginning balance | $ / shares	$ 6.40
Weighted Average Grant Date Fair Value, Granted | $ / shares	7.05
Weighted Average Grant Date Fair Value, Shares released | $ / shares	6.47
Weighted Average Grant Date Fair Value, Forfeited or cancelled | $ / shares	6.79
Weighted Average Grant Date Fair Value, Ending balance | $ / shares	$ 6.99