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Incentive Compensation Plan - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 26, 2015 | Feb. 20, 2015 | Feb. 20, 2015 | Feb. 05, 2015 | Jan. 29, 2015 | Jan. 15, 2015 | Nov. 18, 2014 | Apr. 08, 2014 | Mar. 25, 2014 | Mar. 05, 2014 | Jan. 01, 2014 | Aug. 16, 2013 | May. 31, 2013 | Mar. 01, 2013 | Jan. 28, 2013 | Jan. 02, 2012 | Apr. 01, 2011 | Feb. 24, 2012 | Nov. 21, 2011 | Jan. 17, 2011 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.41 | $ 9.03 | $ 7.25
Maximum number of shares that are available to be awarded |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |
Options granted under plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.5 |  |
Vesting period of restricted stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  | 1 year |  | 1 year | 10 years |  |
Options exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Granted, Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,942,531 |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Grant Price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.07 |  |
Allocated Share-based Compensation Expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.4 |  |
Compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.0 | $ 0.5
Unrecognized compensation cost related to unvested restricted stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.5 |  |
Executive [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) | 1,000 | 34,200 | 10,000 |  |  | 20,000 | 3,500 | 27,500 | 46,000 | 5,000 | 12,626 | 3,000 | 45,000 | 10,000 | 128,611,000 | 100,000 | 25,000 | 68,000,000 | 10,000 | 54,166,000 |  |  |
Grant Price (in dollars per share) | $ 9.84 | $ 8.45 | $ 8.45 |  |  | $ 8.38 | $ 9.26 | $ 8.89 | $ 9.18 | $ 8.75 | $ 8.82 | $ 7.57 | $ 7.21 | $ 7.35 |  | $ 5.26 | $ 6.82 |  | $ 4.41 |  |  |  |
Vesting Date | Jun. 26, 2018 | Dec. 31, 2015 | Feb. 20, 2018 |  |  | Jan. 15, 2017 | Nov. 17, 2017 | Apr. 08, 2017 | Mar. 24, 2017 | Mar. 04, 2017 | Dec. 31, 2014 | Aug. 16, 2016 | May 31, 2016 | Mar. 01, 2016 |  | Jan. 01, 2016 | Apr. 01, 2016 |  | Nov. 21, 2014 |  |  |  |
Number of Equal Vesting Periods | 1 | 1 | 1 |  |  | 1 | 1 | 3 | 1 | 1 | 1 | 1 | 3 | 1 |  | 4 | 1 |  | 1 |  |  |  |
Executive [Member] | Restricted Stock [Member] | Long Term Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,000 |  |  |  |  |
Grant Price (in dollars per share) |  |  |  | $ 8.55 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.96 |  |  |  |  |
Vesting Date |  |  |  | Feb. 05, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 31, 2014 |  |  |  |  |
Number of Equal Vesting Periods |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Executive [Member] | Restricted Stock [Member] | Annual Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued (in shares) |  |  |  |  | 20,170 |  |  |  |  |  |  |  |  |  |  |  |  | 90,000 |  |  |  |  |
Grant Price (in dollars per share) |  |  |  |  | $ 7.93 |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.96 |  |  |  |  |
Vesting Date |  |  |  |  | Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 24, 2015 |  |  |  |  |
Number of Equal Vesting Periods |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |

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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 Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date. + 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 weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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