|
Stock-Based Compensation - Summary of Related Activity under Incentive Plan (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
|
12 Months Ended |
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
| Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
|
|
|
| Awards Available, Beginning balance |
2,815 |
2,009 |
1,858 |
| Plan amendment, Awards Available |
|
1,700 |
1,600 |
| Restricted stock awards granted, Awards Available |
(310) |
(415) |
(211) |
| Restricted stock awards cancelled, Awards Available |
53 |
86 |
8 |
| Stock option awards granted, Awards Available |
(3,277) |
(1,617) |
(1,830) |
| Stock option awards exercised, Awards Available |
|
|
|
| Stock option awards cancelled, Awards Available |
1,801 |
1,052 |
584 |
| Awards Available, Ending balance |
1,082 |
2,815 |
2,009 |
| Options Outstanding, Beginning balance |
8,073 |
7,858 |
6,802 |
| Restricted stock awards granted, Options Outstanding |
|
|
|
| Restricted stock awards cancelled, Options Outstanding |
|
|
|
| Stock option awards granted, Options Outstanding |
3,277 |
1,617 |
1,830 |
| Stock option awards exercised, Options Outstanding |
(563) |
(350) |
(190) |
| Stock option awards forfeited/cancelled, Options Outstanding |
(1,801) |
(1,052) |
(584) |
| Options Outstanding, Ending balance |
8,986 |
8,073 |
7,858 |
| Weighted Average Exercise Price, Beginning balance |
$ 6.09 |
$ 6.21 |
$ 6.66 |
| Restricted stock awards granted, Weighted Average Exercise Price |
|
|
|
| Restricted stock awards cancelled, Weighted Average Exercise Price |
|
|
|
| Stock option awards granted, Weighted Average Exercise Price |
$ 3.05 |
$ 4.65 |
$ 3.97 |
| Stock option awards exercised, Weighted Average Exercise Price |
$ 2.37 |
$ 1.58 |
$ 1.57 |
| Stock option awards cancelled, Weighted Average Exercise Price |
$ 7.22 |
$ 6.26 |
$ 5.99 |
| Weighted Average Exercise Price, Ending balance |
$ 4.99 |
$ 6.09 |
$ 6.21 |