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Stock-Based Compensation Plans - Outstanding Awards Under 2013 Omnibus Equity Incentive Plan (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Nonvested shares at beginning | 891,575 | 981,855
Granted | 355,130 | 258,078
Vested | (400,616) | (333,724)
Transferred | 0 | 0
Forfeited/canceled | (46,014) | (14,634)
Nonvested shares at ending | 800,075 | 891,575
Unrecognized stock-based compensation expense as of December 31, 2019 | $ 22,014 |
Weighted average remaining vesting period (years) as of December 31, 2019 | 3 years 5 months 23 days |
Nonvested weighted average grant date fair value per share, beginning balance | $ 27.59 | $ 23.90
Weighted average grant date fair value per share, Granted | 38.51 | 34.94
Weighted average grant date fair value per share, Vested | 24.29 | 22.31
Weighted average grant date fair value per share, Transferred | 29.68 | 30.69
Weighted average grant date fair value per share, Forfeited/canceled | 30.65 | 30.17
Nonvested weighted average grant date fair value per share, ending balance | $ 33.91 | $ 27.59
Restricted Stock Awards [Member] | Non-Employee Directors [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Nonvested shares at beginning | 27,096 | 30,732
Granted | 12,806 | 12,852
Vested | (22,422) | (16,488)
Transferred | 0 | 0
Forfeited/canceled | 0 | 0
Nonvested shares at ending | 17,480 | 27,096
Unrecognized stock-based compensation expense as of December 31, 2019 | $ 234 |
Weighted average remaining vesting period (years) as of December 31, 2019 | 4 months 20 days |
Restricted Stock Units [Member] | Employees [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Nonvested shares at beginning | 471,782 | 500,859
Granted | 260,274 | 142,760
Vested | (186,311) | (146,122)
Transferred | (8,136) | (23,755)
Forfeited/canceled | (12,494) | (1,960)
Nonvested shares at ending | 525,115 | 471,782
Unrecognized stock-based compensation expense as of December 31, 2019 | $ 13,959 |
Weighted average remaining vesting period (years) as of December 31, 2019 | 3 years 7 months 9 days |
Restricted Stock Units [Member] | Independent Contractors [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Nonvested shares at beginning | 392,697 | 450,264
Granted | 82,050 | 102,466
Vested | (191,883) | (171,114)
Transferred | 8,136 | 23,755
Forfeited/canceled | (33,520) | (12,674)
Nonvested shares at ending | 257,480 | 392,697
Unrecognized stock-based compensation expense as of December 31, 2019 | $ 7,821 |
Weighted average remaining vesting period (years) as of December 31, 2019 | 3 years 4 months 2 days |

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- Definition Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other than Options, Transferred in Period + References No definition available. + Details
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- Definition Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other than Options, Transferred in Period, Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made 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=116856206&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + 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://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)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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