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Stock Compensation Plans - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Stock Based Compensation [Line Items] |  |  |
Stock Option | $ 0 | $ 0 | $ 0
Options outstanding | 0 | 0 |
Compensation expense | $ 5,650,000 | $ 3,250,000 | 2,587,000
Officer [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Vesting period of stock awards | 4 years |  |
One Year Performance Targets Based Shares [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Performance stock vesting period | 4 years |  |
Three Year Performance Targets Based Shares [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Performance stock vesting period | 3 years |  |
Earned Shares [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Total unvested shares | 114,000 |  |
Unearned Shares [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Total unvested shares | 252,000 |  |
Minimum [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Vesting period of stock awards | 3 years |  |
Maximum [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Vesting period of stock awards | 4 years |  |
2009 Equity Incentive Plan [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Number of shares allowed to be issued | 6,149,000 |  |
Percentage of Shares issued and outstanding | 15.30% |  |
Performance Shares [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Number of shares to be earned from awards granted | 0 |  |
Compensation expense | $ 2,479,000 | $ 1,083,000 | $ 600,000
Unamortized future compensation expense | $ 3,864,000 |  |
Performance-based restricted stock awards, performance targets description | Performance-based restricted stock awards granted to executive officers in 2015 were subject to achievement of one-year and three year performance targets established by the Board of Directors. Earned shares related to one-year performance targets vest annually over four years. Earned shares related to three-year targets vest upon completion of the three-year period. |  |
Number of shares to be earned from awards granted | 110,000 | 152,000 | 0
Total unvested shares | 366,000 | 316,000 |
Performance Shares [Member] | Minimum [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Performance period | 1 year |  |
Performance Shares [Member] | Maximum [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Performance period | 3 years |  |
Restricted Stock [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Compensation expense | $ 1,356,000 | $ 1,316,000 | $ 1,871,000
Unamortized future compensation expense | $ 5,930,000 |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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