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Stock-based Compensation - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Shares of common stock authorized for share based payment awards under 2011 Plan | 2,600,000 |  |
Shares available for grant under the 2011 plan | 665,374 |  |
Compensation expenses | $ 6,837,000 | $ 7,151,000 | $ 12,618,000
Decrease increase in market value of company common stock, per share | $ 74.00 | $ 78.97 | $ 81.48
Decrease in market value of common stock | $ 4.97 | $ 2.51 |
Income tax benefit recognized in the income statement for share-based compensation arrangements | $ 1,849,000 | $ 2,980,124 | $ 4,761,000
Proceeds from stock option exercises | $ 4,163,000 | $ 3,370,000 | $ 4,017,000
Stock Option [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Weighted-average grant-date fair values of options awarded | $ 22.13 | $ 24.49 | $ 14.70
Intrinsic values of options exercised | $ 3,879,000 | $ 5,232,000 | $ 6,620,000
Unrecognized compensation cost | $ 1,655,000 |  |
Weighted average period for amortization of unrecognized compensation cost | 1 year 8 months 12 days |  |
Actual tax benefit recognized for the tax deductions from stock based compensation | $ 548,000 | $ 1,455,000 | $ 1,899,000
Stock Option Granted Prior to 2017 [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Vesting period | 2 years |  |
Stock Options Granted in 2017 [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Percentage of awards vesting in each year | 33.33% |  |
Stock Options Granted in 2018 [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Percentage of awards vesting in each year | 33.33% |  |
Performance Stock Award [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Performance stock awards vested | 0 |  |
Stock Awards [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Unrecognized compensation cost | $ 3,180,000 |  |
Weighted average period for amortization of unrecognized compensation cost | 1 year 8 months 12 days |  |
Performance stock awards vested | 119,501 |  |
Weighted-average grant-date fair values of awards granted | $ 72.06 | $ 75.94 | $ 41.81
SARs [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Period of expiration | 10 years |  |
Unrecognized compensation cost | $ 3,566,000 |  |
Weighted average period for amortization of unrecognized compensation cost | 1 year 9 months 18 days |  |
Weighted-average grant-date fair values of awards granted | $ 22.19 | $ 24.90 | $ 14.69
SARs liability cash-settled | $ 3,647,000 | $ 4,760,000 |
SARs Granted Prior to 2017 [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Vesting period | 2 years |  |
SARs Granted in 2017 [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Percentage of awards vesting in each year | 33.33% |  |
SARs Granted in 2018 [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Percentage of awards vesting in each year | 33.33% |  |
Maximum [Member] | Stock Option [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Period of expiration | 10 years |  |
Minimum [Member] | Stock Option [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Period of expiration | 8 years |  |

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- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: 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 2: 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 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109245112&loc=d3e23524-113945 + 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://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=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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