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Share-Based Compensation - Summary of Stock Options Outstanding under Plans (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |  |
Number of Shares, Options outstanding at beginning of period (shares) | 337,688 | 338,338 |  | 338,338 |  |
Number of shares, Stock options exercised (shares) | (1,250) |  | 0 | (1,900) | (25,750) |
Number of Shares, Options outstanding at end of period (shares) | 336,438 | 337,688 |  | 336,438 |  | 338,338
Number of Shares, Options exercisable at end of period (shares) | 336,438 |  |  | 336,438 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |  |  |  |
Weighted-Average Exercise Price Per Share, Options outstanding at beginning of period (in usd per share) | $ 17.53 | $ 17.52 |  | $ 17.52 |  |
Weighted-Average Exercise Price Per Share, Options exercised (in usd per share) | 10.80 |  |  | 11.40 |  |
Weighted-Average Exercise Price Per Share, Options outstanding at end of period (in usd per share) | 17.55 | $ 17.53 |  | 17.55 |  | $ 17.52
Weighted-Average Exercise Price Per Share, Options exercisable at end of period (in usd per share) | $ 17.55 |  |  | $ 17.55 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term [Abstract] |  |  |  |  |  |
Weighted-Average Remaining Contractual Life, Options outstanding at beginning of period | 4 years 4 months 24 days | 4 years 7 months 6 days |  | 4 years 4 months 24 days |  | 4 years 7 months 6 days
Weighted-Average Remaining Contractual Life, Options exercised | 0 years |  |  | 1 year |  |
Weighted-Average Remaining Contractual Life, Options outstanding at end of period | 4 years 4 months 24 days | 4 years 7 months 6 days |  | 4 years 4 months 24 days |  | 4 years 7 months 6 days
Weighted-Average Remaining Contractual Life, Options exercisable at end of period | 4 years 4 months 24 days |  |  |  |  |
Aggregate Intrinsic Value of In-the-Money Options, Options outstanding at beginning of period | $ 1,356 | $ 1,356 |  | $ 1,356 |  |
Aggregate Intrinsic Value of In-the-Money Options, Options exercised | 0 |  |  | 18 |  |
Aggregate Intrinsic Value of In-the-Money Options, Options outstanding at end of period | 1,162 | $ 1,356 |  | 1,162 |  | $ 1,356
Aggregate Intrinsic Value of In-the-Money Options, Options exercisable at end of period | $ 1,162 |  |  | $ 1,162 |  |
Intrinsic value represents the excess of the closing stock price related to options outstanding (in usd per share) | $ 22.27 | $ 21.27 |  | $ 22.27 |  | $ 19.70

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Options Exercise In Period Weighted Average Remaining Contractual Term + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term [Abstract] + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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=116856206&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option 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)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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