v3.3.1.900

Share-Based Compensation - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum term of stock option | 10 years |  |
Amendment effective date | Jun. 02, 2015 |  |
Share-based compensation expense | $ 7,954,000 | $ 8,247,000 | $ 5,901,000
Shares subject to stock options, granted | 0 | 0 | 0
Shares subject to stock options, shares exercisable | 38,525 |  |
Weighted average exercise price, outstanding | $ 12.00 |  |
Weighted average remaining contractual term, outstanding | 1 year 10 months 10 days |  |
Number of stock options exercised | 0 | 0 |
Intrinsic value of the options exercised |  |  | $ 35,000
Tax benefit recognized related to the stock option exercises |  |  | 0
Service period | 3 years 6 months |  |
Current fiscal year employer matching contribution description | We make a matching contribution equal to 100% of each pre-tax dollar contributed by the participant on the first 3% of eligible compensation and 50% on the next 2% of eligible compensation |  |
Contributions to employee benefit plan | $ 404,000 | $ 310,000 | 279,000
Primary [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employer matching contribution, percentage | 100.00% |  |
Secondary [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employer matching contribution, percentage | 50.00% |  |
Non Employee Director [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | $ 735,000 | 749,000 | 630,000
2007 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
The maximum number of common stock | 3,625,000 |  |
Forfeiture Benefit Adjustments Member [Member] | Executive Officers [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Forfeited stock awards |  | $ 1,100,000 | $ 1,000,000
Nonvested Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares grant | 1,278,329 | 992,919 | 377,379
Average grant date fair value | $ 6,200,000 | $ 14,400,000 | $ 8,600,000
Unrecognized compensation expense related to nonvested shares | $ 7,900,000 |  |
Nonvested outstanding weighted average remaining service period | 3 years |  |
Nonvested Shares [Member] | Executive Officers [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Additional shares grant | 724,249 | 245,157 | 183,672
Additional share grant fair value | $ 4,500,000 | $ 4,500,000 | $ 4,400,000
Total Shareholder Return Performance Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Subsequent restricted share award | 550,272 |  |
Fair market value of shares subject to performance conditions | $ 300,000 |  |
Cash Settled Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Subsequent restricted share award | 1,100,543 |  |
Fair market value of shares subject to performance conditions | $ 1,000,000 |  |

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