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Share-based Compensation - Summary of Stock Options Outstanding under Plans (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding, Number of Shares | 364,088 | 387,901 | 510,148 | 603,872
Options Outstanding, Intrinsic Value | $ 4,548 |  |  |
Options Outstanding, Weighted-Average Exercise Price Per Share (in usd per share) | $ 17.86 | $ 17.49 | $ 24.38 | $ 23.78
Options Outstanding, Weighted-Average Remaining Contractual Life |  |  |  |
Options Exercisable, Number of Shares | 354,753 | 341,561 | 333,460 |
Options Exercisable, Intrinsic Value | $ 4,483 |  |  |
Options Exercisable, Weighted-Average Exercise Price Per Share (in usd per share) | $ 17.71 | $ 16.85 | $ 27.16 |
Options Exercisable, Weighted-Average Remaining Contractual Life |  |  |  |
Intrinsic value of stock options outstanding (in usd per share) | $ 30.35 |  |  |
$10.88 to $14.99 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise Price Range, Lower Limit (in usd per share) | 10.88 |  |  |
Exercise Price Range, Upper Limit (in usd per share) | $ 14.99 |  |  |
Options Outstanding, Number of Shares | 13,088 |  |  |
Options Outstanding, Intrinsic Value | $ 235 |  |  |
Options Outstanding, Weighted-Average Exercise Price Per Share (in usd per share) | $ 12.37 |  |  |
Options Outstanding, Weighted-Average Remaining Contractual Life | 4 years 7 months |  |  |
Options Exercisable, Number of Shares | 13,088 |  |  |
Options Exercisable, Intrinsic Value | $ 235 |  |  |
Options Exercisable, Weighted-Average Exercise Price Per Share (in usd per share) | $ 12.37 |  |  |
Options Exercisable, Weighted-Average Remaining Contractual Life | 4 years 7 months |  |  |
$15.00 to $19.99 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise Price Range, Lower Limit (in usd per share) | $ 15.00 |  |  |
Exercise Price Range, Upper Limit (in usd per share) | $ 19.99 |  |  |
Options Outstanding, Number of Shares | 255,000 |  |  |
Options Outstanding, Intrinsic Value | $ 3,550 |  |  |
Options Outstanding, Weighted-Average Exercise Price Per Share (in usd per share) | $ 16.43 |  |  |
Options Outstanding, Weighted-Average Remaining Contractual Life | 5 years 8 months |  |  |
Options Exercisable, Number of Shares | 255,000 |  |  |
Options Exercisable, Intrinsic Value | $ 3,550 |  |  |
Options Exercisable, Weighted-Average Exercise Price Per Share (in usd per share) | $ 16.43 |  |  |
Options Exercisable, Weighted-Average Remaining Contractual Life | 5 years 8 months |  |  |
$20.00 to $24.83 [Member] |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Exercise Price Range, Lower Limit (in usd per share) | $ 20.00 |  |  |
Exercise Price Range, Upper Limit (in usd per share) | $ 24.83 |  |  |
Options Outstanding, Number of Shares | 96,000 |  |  |
Options Outstanding, Intrinsic Value | $ 763 |  |  |
Options Outstanding, Weighted-Average Exercise Price Per Share (in usd per share) | $ 22.41 |  |  |
Options Outstanding, Weighted-Average Remaining Contractual Life | 6 years 8 months |  |  |
Options Exercisable, Number of Shares | 86,665 |  |  |
Options Exercisable, Intrinsic Value | $ 698 |  |  |
Options Exercisable, Weighted-Average Exercise Price Per Share (in usd per share) | $ 22.29 |  |  |
Options Exercisable, Weighted-Average Remaining Contractual Life | 6 years 7 months |  |  |

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- Definition The excess of the closing stock price on the last day of the trading period over the exercise price. + 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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://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=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + 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 (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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=96867065&loc=d3e5070-113901 + Details
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