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Share-Based Compensation - Certain Information Regarding Company's Share-Based Compensation (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense, Total | $ 8,695 | $ 13,008 | $ 12,786
Deferred tax benefits, Total | 877 | 1,754 | 2,830
Realized tax benefits, Total | 275 | 1,777 | 8,877
Excess tax benefits (shortfall) | (237) | 641 | 5,427
Intrinsic value of options exercised | 0 | 2,343 | 32,217
Vesting of performance share units | 646 | 2,069 | 1,273
Cash received for strike price and tax withholdings | $ 0 | $ 238 | $ 120
Shares acquired through cashless exercise | 64 | 186 | 1,361
Value of shares acquired through cashless exercise | $ 1,315 | $ 6,133 | $ 49,199
Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense, Stock options | 4,519 | 6,516 | 7,579
Deferred tax benefits, Total | 719 | 1,522 | 1,877
Realized tax benefits, Total | 0 | 577 | 7,957
Excess tax benefits (shortfall) | $ (209) | $ 415 | $ 5,330
Weighted average fair value per option or share, Stock option grants (in dollars per share) | $ 3.67 | $ 9.82 | $ 11.74
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 514 | $ 3,104 | $ 609
Deferred tax benefits, Total | 0 | 47 | 8
Realized tax benefits, Total | 0 | 37 | 0
Excess tax benefits (shortfall) | $ 0 | $ (18) | $ 0
Granted, weighted average grant date fair value (in dollars per share) | $ 0 | $ 30.73 | $ 33.64
Vesting of performance share units | $ 252 | $ 2,783 | $ 632
Performance Share Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | 945 | 2,508 | 4,598
Deferred tax benefits, Total | 52 | 185 | 945
Realized tax benefits, Total | 275 | 1,163 | 920
Excess tax benefits (shortfall) | $ (28) | $ 244 | $ 97
Granted, weighted average grant date fair value (in dollars per share) | $ 0 | $ 33.47 | $ 32.51
Vesting of performance share units | $ 2,151 | $ 5,520 | $ 3,726
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | 2,717 | 880 | 0
Deferred tax benefits, Total | 106 | 0 | 0
Realized tax benefits, Total | 0 | 0 | 0
Excess tax benefits (shortfall) | $ 0 | $ 0 | $ 0
Granted, weighted average grant date fair value (in dollars per share) | $ 16.13 | $ 26.47 | $ 0
Vesting of performance share units | $ 1,559 | $ 657 | $ 0

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- Definition Amount of increase (decrease) to additional paid-in capital (APIC) for recognition and exercise of award under share-based payment arrangement. + References No definition available. + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&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=120381028&loc=d3e5070-113901 + Details
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