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Summary of Treasury Stock Activity (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Treasury Stock Shares [Abstract] |  |  |  |
Beginning Balance, Shares |  | 4,525,870 | 4,447,002 | 4,183,504
Restricted stock withholdings | [1] | 75,801 | 68,527 | 206,690
Restricted stock forfeitures | [2] | 24,520 | 10,341 | 56,808
Ending Balance, Shares |  | 4,626,191 | 4,525,870 | 4,447,002
Beginning Balance, Cost |  | $ 76,354 | $ 73,411 | $ 66,577
Restricted stock withholdings | [1] | 2,905 | 2,943 | 6,834
Restricted stock forfeitures | [2] | 0 | 0 | 0
Ending Balance, Cost |  | $ 79,259 | $ 76,354 | $ 73,411
[1] | The Company withheld restricted shares as a result of the election by certain employees to satisfy their tax liabilities upon vesting in restricted stock and restricted stock units. The Company determined the number of shares to be withheld based upon market values that ranged from $29.17 to $44.44 per share.
[2] | The Company repurchased forfeited restricted shares at a cost of $0.001 per share in accordance with the 2017 Omnibus Plan.

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- Definition Cost of shares withheld by the company to cover tax withholdings related to restricted stock and restricted stock unit vesting. + References No definition available. + Details
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- Definition Number of restricted shares withheld by the company to cover tax withholdings related to restricted stock and restricted stock unit vesting. + References No definition available. + Details
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- Definition Number of shares related to Restricted Stock Award forfeited during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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