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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 23, 2018 | May 07, 2018 | Apr. 30, 2018 | Feb. 22, 2018 | Feb. 15, 2018 | May 30, 2017 | Feb. 27, 2017 | Mar. 09, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unrecognized stock based compensation related to all stock-based awards |  |  |  |  |  |  |  |  | $ 16,900 |  |
Weighted average period, expense to recognize |  |  |  |  |  |  |  |  | 1 year 8 months 12 days |  |
Intrinsic value of stock option awards exercised |  |  |  |  |  |  |  |  | $ 873 | $ 4,500 | $ 324
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of restricted stock units vested |  |  |  |  |  |  |  |  | 17,800 | 8,800 | 4,600
Grant date fair value of restricted stock awards granted or assumed |  |  |  |  |  |  |  |  | $ 15,800 | $ 18,400 | $ 21,800
Restricted stock units, granted (shares) |  |  |  |  |  |  |  |  | 1,131,231 |  |
Restricted stock units, vested (shares) |  |  |  |  |  |  |  |  | 1,102,727 |  |
Fair value of awards (in usd per share) |  |  |  |  |  |  |  |  | $ 11.05 | $ 9.80 |
Restricted Stock Units (RSUs) [Member] | Employees and Officers [Member] | Total Shareholder Return [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted stock units, granted (shares) |  | 4,258 |  | 633,107 |  |  | 990,279 |  |  |  |
Restricted stock units, vesting period |  |  |  | 3 years |  |  | 3 years |  |  |  |
Closing stock price on date of grant (in usd per share) |  | $ 17.61 |  | $ 16.94 |  |  | $ 12.10 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted stock units, granted (shares) |  |  |  | 184,179 |  |  | 257,851 |  |  |  |
Restricted Stock Units (RSUs) [Member] | President [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted stock units, granted (shares) |  |  |  | 177,095 |  |  | 247,933 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Chief Financial Officer [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted stock units, granted (shares) |  |  |  | 85,005 |  |  | 119,008 |  |  |  |
Restricted stock units, vested (shares) |  |  |  |  | 197,898 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Board of Directors [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted stock units, granted (shares) |  |  |  |  |  | 55,865 |  |  |  |  |
Closing stock price on date of grant (in usd per share) |  |  |  |  |  | $ 12.53 |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Board of Directors [Member] | Total Shareholder Return [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restricted stock units, granted (shares) | 6,677 |  | 40,910 |  |  |  |  |  |  |  |
Closing stock price on date of grant (in usd per share) | $ 16.37 |  | $ 17.11 |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Employees, officers and Directors [Member] | Earnings Per Share [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Closing stock price on date of grant (in usd per share) |  |  |  | $ 16.94 |  |  | $ 12.10 |  |  |  |
Fair value of awards (in usd per share) |  |  |  | $ 10.97 |  |  | $ 6.16 |  |  |  |
Performance-based RSUs [Member] | Total Shareholder Return [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allocation amount (percent) |  |  |  |  |  |  |  | 33.33% |  |  |
Performance-based RSUs [Member] | Earnings Per Share [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allocation amount (percent) |  |  |  |  |  |  |  | 33.33% |  |  |
Performance-based RSUs [Member] | Stock Price [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allocation amount (percent) |  |  |  |  |  |  |  | 33.33% |  |  |
2013 Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock (shares) |  |  |  |  |  |  |  |  | 11,727,833 |  |
Shares available for future grant (shares) |  |  |  |  |  |  |  |  | 6,455,011 |  |
Minimum [Member] | Restricted Stock Units (RSUs) [Member] | Earnings Per Share [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allocation amount (percent) |  |  |  | 0.00% |  |  | 0.00% |  |  |  |
Maximum [Member] | Restricted Stock Units (RSUs) [Member] | Earnings Per Share [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allocation amount (percent) |  |  |  | 100.00% |  |  | 100.00% |  |  |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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