Equity Incentive Plans - Summary of Nonvested Restricted Stock and Restricted Stock Units Activity (Detail) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares Nonvested, Beginning Balance	1,169	494	1,015
Number of Shares, Granted	764	1,181
Number of Shares, Vested	(614)	(489)	(487)
Number of Shares, Forfeited or Cancelled	(51)	(17)	(34)
Number of Shares Nonvested Ending Balance	1,268	1,169	494
Weighted-Average Grant Date Fair Value, Beginning Balance	$ 4.15	$ 2.73	$ 2.43
Weighted-Average Grant Date Fair Value, Granted	8.25	4.51
Weighted-Average Grant Date Fair Value, Vested	4.91	3.38	2.16
Weighted-Average Grant Date Fair Value, Forfeited or Cancelled	4.52	2.53	1.78
Weighted-Average Grant Date Fair Value, Ending Balance	$ 6.39	$ 4.15	$ 2.73