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Employee Benefit Plans - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total company expenses under the health plan | $ 3,480,000 | $ 3,060,000 | $ 2,880,000
Deferred compensation Liability | 458,000 | 458,000 |
Deferred compensation Expense | $ 60,000 | $ 60,000 | $ 60,000
Common stock held in employer stock fund | 410,384 | 428,785 | 457,765
Stock Options |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Intrinsic value of options exercised | $ 434,000 | $ 20,000 | $ 13,000
Unrecognized compensation cost related to nonvested stock options | $ 101,000 |  |
Unrecognized compensation cost expected to be recognized over a weighted average period | 1 year 1 month 10 days |  |
Restricted Stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Unrecognized compensation cost expected to be recognized over a weighted average period | 2 years 11 days |  |
Unrecognized compensation cost related to nonvested stock awards | $ 447,000 |  |
Performance Shares |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Unrecognized compensation cost related to nonvested stock awards | $ 0 |  |
2012 Plan | Stock Options |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Shares available for potential grants | 600,000 |  |
Option granted, maximum exercise period | 10 years |  |
Vesting period | 4 years |  |
2012 Plan | Stock Options | For the first four anniversaries of the grant date |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percentage of stock award vesting | 25.00% |  |
Individual Counterparty |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Stop loss insurance liability | $ 125,000 |  |
Aggregate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Stop loss insurance liability | 3,920,000 |  |
401 (k) Savings Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Employer Matching Contributions | $ 1,500,000 | $ 1,530,000 | $ 1,580,000
Supplemental Executive Retirement Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Contribution Plan Maximum Employee Contribution As Percentage Of Average Compensation | 35.00% |  |
Defined Benefit Plan, Employee Contribution, Age | 62 years |  |
Directors Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Employee Contribution, Age | 70 years |  |
Defined Contribution Plan Maximum Employee Contribution As Percentage Of Base Salary | 100.00% |  |

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- Definition Number of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 25 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65888597&loc=d3e16701-113920 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The amount of costs recognized during the period for non-pension postretirement benefits, such as medical, dental and life insurance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (q) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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