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Equity Incentive Awards - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 | May. 31, 2015 | Feb. 28, 2015 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation |  |  |  | $ 2,200 | $ 1,700 | $ 3,960 | $ 2,431
Number of shares available for grant | 3,405,794 |  |  | 3,405,794 |  | 3,405,794 |
Management |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting rights | Full |  | Full |  |  |  |
Director |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting rights |  | One-third | One-third |  |  |  |
Restricted Stock | Management |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity instruments other than options, grants in period | 3,000 |  | 78,000 |  |  |  |
Fair value of shares issued | $ 200 |  | $ 4,300 |  |  |  |
Equity instruments other than options vesting date | Dec. 31, 2015 |  | Dec. 31, 2015 |  |  |  |
Restricted Stock | Director |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity instruments other than options, grants in period |  | 29,440 | 47,100 |  |  |  |
Fair value of shares issued |  | $ 1,600 | $ 2,600 |  |  |  |
Restricted Stock | Director | Phase One |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity instruments other than options vesting date |  | Nov. 12, 2015 | Dec. 31, 2015 |  |  |  |
Restricted Stock | Director | Phase Two |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity instruments other than options vesting date |  | May 12, 2016 | Dec. 31, 2016 |  |  |  |
Restricted Stock | Director | Phase Three |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity instruments other than options vesting date |  | May 12, 2017 | Dec. 31, 2017 |  |  |  |
Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares authorized for issuance | 3,750,000 |  |  | 3,750,000 |  | 3,750,000 |

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- Definition Description of the period of time over which a director's right to exercise an award is no longer contingent on the passage of time, which may be expressed in a variety of ways (for example, in years, month and year). + References No definition available. + Details
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- Definition The total fair value of shares issued during the period under a deferred compensation arrangement. + 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) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 number of grants made 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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