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Stock-Based Compensation Plans - Outstanding Awards Under 2013 Omnibus Equity Incentive Plan (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 9 Months Ended
--- | --- | ---
Aug. 31, 2016 | May 31, 2016 | Mar. 31, 2016 | Feb. 29, 2016 | Nov. 30, 2013 | Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Nonvested shares, beginning balance |  |  |  |  |  | 1,026,113
Granted | 62,389 | 33,981 | 30,000 | 181,352 |  | 307,722
Vested |  |  |  |  |  | (239,396)
Forfeited/canceled |  |  |  |  |  | (41,434)
Nonvested shares, ending balance |  |  |  |  |  | 1,053,005
Unrecognized stock-based compensation expense as of September 30, 2016 |  |  |  |  |  | $ 20,603
Weighted average remaining vesting period (years) as of September 30, 2016 |  |  |  |  |  | 3 years 2 months 19 days
Nonvested weighted average grant date fair value per share, beginning balance |  |  |  |  |  | $ 21.17
Weighted average grant date fair value per share, Granted | $ 0 | $ 0 | $ 0 | $ 0 |  | 23.79
Weighted average grant date fair value, Vested |  |  |  |  |  | 20.03
Weighted average grant date fair value, Forfeited/canceled |  |  |  |  |  | 21.64
Nonvested weighted average grant date fair value per share, ending balance |  |  |  |  |  | $ 22.18
Restricted Stock Awards [Member] | Non-Employee Directors [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Nonvested shares, beginning balance |  |  |  |  |  | 35,364
Granted | 0 | 14,742 | 0 | 0 | 30,000 | 14,742
Vested |  |  |  |  |  | (10,998)
Forfeited/canceled |  |  |  |  |  | 0
Nonvested shares, ending balance |  |  |  |  |  | 39,108
Unrecognized stock-based compensation expense as of September 30, 2016 |  |  |  |  |  | $ 584
Weighted average remaining vesting period (years) as of September 30, 2016 |  |  |  |  |  | 1 year 11 months 19 days
Restricted Stock Units (RSUs) [Member] | Employees [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Nonvested shares, beginning balance |  |  |  |  |  | 468,969
Granted | 12,781 | 11,051 | 30,000 | 172,496 |  | 226,328
Vested |  |  |  |  |  | (103,428)
Forfeited/canceled |  |  |  |  |  | (37,299)
Nonvested shares, ending balance |  |  |  |  |  | 554,570
Unrecognized stock-based compensation expense as of September 30, 2016 |  |  |  |  |  | $ 10,836
Weighted average remaining vesting period (years) as of September 30, 2016 |  |  |  |  |  | 3 years 7 months 6 days
Restricted Stock Units (RSUs) [Member] | Independent Contractors [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Nonvested shares, beginning balance |  |  |  |  |  | 521,780
Granted | 49,608 | 8,188 | 0 | 8,856 |  | 66,652
Vested |  |  |  |  |  | (124,970)
Forfeited/canceled |  |  |  |  |  | (4,135)
Nonvested shares, ending balance |  |  |  |  |  | 459,327
Unrecognized stock-based compensation expense as of September 30, 2016 |  |  |  |  |  | $ 9,183
Weighted average remaining vesting period (years) as of September 30, 2016 |  |  |  |  |  | 2 years 10 months 10 days

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- Definition Unrecognized cost of unvested share-based compensation awards. + 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=6415400&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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&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://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=6415400&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://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=6415400&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=6415400&loc=d3e5070-113901 + Details
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