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Stock Incentive Plans - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 USD ($) Installment shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
New grants of stock option | shares | 0 |  |
Outstanding options expiration period from the date of grant | 10 years |  |
Share-based compensation expense included in selling, general and administrative expenses | $ 4,200,000 | $ 2,800,000 | $ 2,400,000
Share-based compensation, income tax benefits | $ 1,500,000 | $ 1,100,000 | $ 948,000
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of equal annual installments options are exercisable | Installment | 4 |  |
Options exercisable period after date of grant | 1 year |  |
Weighted average fair value of stock options, granted | $ / shares |  | $ 17.10 | $ 10.76
Stock options granted with an exercise price below market price | shares | 0 | 0 | 0
Intrinsic value of stock options exercised | $ 479,000 | $ 113,000 | $ 1,100,000
Fair value of shares vested during the period | 328,000 | 319,000 | 383,000
Unrecognized compensation expense | $ 414,000 |  |
Weighted average remaining amortization period | 1 year 6 months |  |
Restricted Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Options exercisable period after date of grant | 1 year |  |
Fair value of shares vested during the period | $ 3,300,000 | $ 1,900,000 | $ 1,700,000
Unrecognized compensation expense | $ 9,100,000 |  |
Weighted average remaining amortization period | 2 years 9 months 18 days |  |
Number of equal annual installments in which restricted stock units vest | Installment | 4 |  |
Two Thousand And Fifteen Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares of common stock reserved for issuance under the 2015 Plan | shares | 1,000,000 |  |
Aggregate number of shares for which incentive stock options may be granted under the Plan | shares | 900,000 |  |
2009 Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares available for grant | shares | 693,686 |  |

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- Definition Share based compensation arrangement by share based payment award number of shares available for grant under stock incentive plan. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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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