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Share-based Compensation - Additional Information (Detail) (USD $)
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12 Months Ended |
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock option contractual term |
6 years 6 months |
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| Stock-based compensation |
$ 3,708,000 |
$ 3,610,000 |
$ 2,401,000 |
| Unrecognized compensation expense for employee stock options |
2,500,000 |
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| Unrecognized compensation expense related to unvested shares of restricted stock |
1,600,000 |
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| Granted |
41,000 |
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| Vested |
25,000 |
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| Annual employee contribution to plan through payroll deduction |
25,000 |
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| Discount rate for stock purchases under ESPP |
5.00% |
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Stock Option
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock vesting period |
3 years |
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| Stock-based compensation |
1,700,000 |
2,000,000 |
1,400,000 |
| Allocated Share-based Compensation Expense |
(200,000) |
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| Income tax benefit (expense) |
(100,000) |
900,000 |
0 |
| Unrecognized compensation expense for employee stock options |
2,500,000 |
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| Unrecognized compensation expense expected recognition period |
9 months 18 days |
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Stock Option | Discontinued Operations
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock-based compensation |
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|
500,000 |
| Stock options vested |
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|
300,000 |
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Stock Option | Maximum
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock option contractual term |
10 years |
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Restricted Stock
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock-based compensation |
1,400,000 |
1,600,000 |
1,000,000 |
| Allocated Share-based Compensation Expense |
(200,000) |
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| Income tax benefit (expense) |
(200,000) |
700,000 |
0 |
| Unrecognized compensation expense expected recognition period |
1 year 3 months 18 days |
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| Unrecognized compensation expense related to unvested shares of restricted stock |
1,600,000 |
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| Fair value of shares vested during period |
400,000 |
400,000 |
1,300,000 |
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Restricted Stock | Maximum
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock vesting period |
3 years |
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Restricted Stock | Minimum
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock vesting period |
2 years |
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Restricted Stock Units
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock-based compensation |
600,000 |
0 |
0 |
| Income tax benefit (expense) |
200,000 |
0 |
0 |
| Unrecognized compensation expense expected recognition period |
1 year 3 months 18 days |
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| Unrecognized compensation expense related to unvested shares of restricted stock |
$ 1,400,000 |
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| Granted |
62,000 |
0 |
0 |
| Vested |
0 |
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Restricted Stock Units | Maximum
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock vesting period |
3 years |
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Restricted Stock Units | Minimum
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Stock vesting period |
2 years |
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