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Stock-based Compensation - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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 | 945,161 |  |
Compensation expenses | $ 7,151,000 | $ 12,618,000 | $ 4,374,000
Decrease increase in market value of company common stock, per share | $ 78.97 | $ 81.48 | $ 31.79
Income tax benefit recognized in the income statement for share-based compensation arrangements | $ 2,980,124 | $ 4,761,000 | $ 1,654,000
Proceeds from stock option exercises | $ 3,370,000 | $ 4,017,000 | 777,000
Actual tax benefit recognized for the tax deductions from stock based compensation |  |  | $ 442,000
Stock Option [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Weighted-average grant-date fair values of options awarded | $ 24.49 | $ 14.70 | $ 15.59
Intrinsic values of options exercised | $ 5,232,000 | $ 6,620,000 | $ 1,426,000
Unrecognized compensation cost | $ 1,179,000 |  |
Weighted average period for amortization of unrecognized compensation cost | 2 years |  |
Actual tax benefit recognized for the tax deductions from stock based compensation | $ 1,455,000 | $ 1,899,000 | $ 351,000
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 |  |
Vesting percentage for 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 | $ 3,737,000 |  |
Weighted average period for amortization of unrecognized compensation cost | 1 year 6 months |  |
Performance stock awards vested | 113,738 |  |
Weighted-average grant-date fair values of awards granted | $ 75.94 | $ 41.81 | $ 39.11
SARs [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Period of expiration | 10 years |  |
Unrecognized compensation cost | $ 2,398,000 |  |
Weighted average period for amortization of unrecognized compensation cost | 2 years |  |
Weighted-average grant-date fair values of awards granted | $ 24.90 | $ 14.69 | $ 15.60
SARs liability cash-settled | $ 4,760,000 | $ 5,832,000 |
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 |  |
Vesting percentage for 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=79981250&loc=d3e23524-113945 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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