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Benefit Plans - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2009 | Jun. 06, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of additional shares authorized |  |  |  | 1,500,000 | 815,000 |
Share-based compensation expense | $ 3,399,000 | $ 3,854,000 | $ 3,680,000 |  |  |
Tax benefit related to share-based compensation expense | 1,300,000 | 1,500,000 | 1,400,000 |  |  |
Capitalized share-based compensation expense | 0 | 0 | 0 |  |  |
Amount of reduction in net income due to share-based compensation expense | $ 2,100,000 | $ 2,300,000 | $ 2,200,000 |  |  |
Amount of reduction in diluted earning per share to share-based compensation expense | $ 0.08 | $ 0.09 | $ 0.09 |  |  |
Stock option plans remain outstanding | 1,410,650 | 1,343,760 | 1,772,062 | 2,838,553 |  |
Weighted average grant date fair value | $ 6.60 | $ 9.17 | $ 9.87 |  |  |
Plan merged assets | $ 16,400,000 |  |  |  |  |
Dividends deducted | 300,000 |  |  |  |  |
Tax benefit from dividends | $ 100,000 |  |  |  |  |
Shares outstanding, employee stock ownership plan | 339,640 |  |  |  |  |
Percentage of total common shares outstanding | 2.00% |  |  |  |  |
Stock Options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of additional shares authorized | 843,024 |  |  |  |  |
Stock options granted | 7,277,200 |  |  |  |  |
Stock options, exercise prices lower | $ 3.47 |  |  |  |  |
Stock options, exercise prices upper | $ 38.89 |  |  |  |  |
Purchase of shares | 4,854,518 |  |  |  |  |
Stock option shares terminated | 1,012,032 |  |  |  |  |
Stock option plans remain outstanding | 1,410,650 |  |  |  |  |
Stock options outstanding, exercise prices lower | $ 15.62 |  |  |  |  |
Stock options outstanding, exercise prices upper | $ 38.89 |  |  |  |  |
Stock options vesting period | 5 years |  |  |  |  |
Options issued to non-employee advisors | 0 |  |  |  |  |
Aggregate intrinsic value of options exercised and sold | $ 5,700,000 | $ 8,400,000 | $ 11,500,000 |  |  |
Total unrecognized compensation cost | $ 4,500,000 |  |  |  |  |
Expected recognition period of unrecognized compensation expense | 2 years 8 months 12 days |  |  |  |  |
Performance-based RSUs [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options vesting period | 5 years |  |  |  |  |
Percentage of vesting annually at anniversary | 20.00% |  |  |  |  |
Number of RSU's expected to vest | 66,651 |  |  |  |  |
Performance-based RSUs [Member] | Vesting after three years [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of vesting RSUs | 60.00% |  |  |  |  |
Service-based RSUs [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of RSU's expected to vest | 18,000 |  |  |  |  |
Number of forfeitures expected | 0 |  |  |  |  |
Restricted Stock Units [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Expected recognition period of unrecognized compensation expense | 2 years 4 months 24 days |  |  |  |  |
Number of forfeitures expected | 80,320 | 7,540 | 4,300 |  |  |
Stock-based compensation expense for restricted stock | $ 1,700,000 | $ 2,300,000 | $ 2,000,000 |  |  |
Total unrecognized compensation expense net of forfeitures | $ 1,100,000 |  |  |  |  |
Minimum [Member] | Stock Options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Options Outstanding, Weighted-Average Remaining Contractual Life (Years) | 7 years |  |  |  |  |
Minimum [Member] | Service-based RSUs [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options vesting period | 12 months |  |  |  |  |
Maximum [Member] | Stock Options [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Options Outstanding, Weighted-Average Remaining Contractual Life (Years) | 10 years |  |  |  |  |
Maximum [Member] | Service-based RSUs [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options vesting period | 14 months |  |  |  |  |
2007 Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Reduction in common stock available for grant | 2 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares of common stock remained available for grants of awards |  |  |  |  |  | 1,875,000
Minimum rate of exercise price granted | 100.00% |  |  |  |  |

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- Definition Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
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