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Incentive Compensation - Additional Information (Details) - USD ($) |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 17, 2020 | Mar. 18, 2019 | Jan. 14, 2019 | Jan. 30, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2020 | Nov. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Fair value of stock options granted |  |  |  |  |  |  | $ 4.02 |  |
Performance Programs [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 4 years |  |  |  |
Unrecognized compensation cost expected to be recognized over a weighted-average period |  |  |  |  | 2 years 4 months 24 days |  |  |  |
Performance measurement period, term |  |  |  |  | 3 years |  |  |  |
Fair value of awards granted |  |  |  |  | $ 8,106,000 | $ 7,009,000 | $ 10,520,000 |  |
Unrecognized compensation cost |  |  |  |  | $ 9,504,000 |  |  |  |
Units, Granted |  |  |  |  | 1,356,630 |  |  |  |
Remaining units nonvested |  |  |  |  | 3,595,834 | 3,373,570 |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 4 years |  |  |  |
Fair value granted |  |  |  |  | $ 1,238,000 | $ 1,335,000 | 1,309,000 |  |
Unrecognized compensation cost expected to be recognized over a weighted-average period |  |  |  |  | 2 years 3 months 18 days |  |  |  |
Unrecognized compensation cost |  |  |  |  | $ 1,823,000 |  |  |  |
Units, Granted |  |  |  |  | 93,308 |  |  |  |
Vested units |  |  |  |  | 63,821 |  |  |  |
Remaining units nonvested |  |  |  |  | 168,470 | 162,981 |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  | $ 60,000 |  |  |  |
Stock options, granted |  |  |  |  | 0 | 0 |  |  |
Stock Options Expiration Period |  |  |  |  | 10 years |  |  |  |
Employee Stock Option [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 5 years |  |  |  |
Employee Stock Option [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |  |  |
Equity Incentive Plan [Member] | Full Value Awards [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares available for grant |  |  |  |  | 8,358,300 |  |  |  |
Equity Incentive Plan [Member] | Full Value Awards [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares available for grant |  |  |  |  |  |  |  |  | 17,142,857
Equity Incentive Plan [Member] | Not Full Value Awards [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares available for grant |  |  |  |  |  |  |  |  | 34,285,714
LTIP Units [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Fair value granted |  |  |  |  | $ 13,091,000 | $ 10,145,000 | $ 7,467,000 |  |
Unrecognized compensation cost |  |  |  |  | $ 12,854,000 |  |  |  |
Unrecognized compensation cost expected to be recognized over a weighted-average period |  |  |  |  | 2 years 7 months 6 days |  |  |  |
Units, Granted |  |  |  |  | 1,067,854 |  |  |  |
Vested units |  |  |  |  | 752,645 |  |  |  |
Remaining units nonvested |  |  |  |  | 1,571,464 | 1,284,083 |  |  |
LTIP Units [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 5 years |  |  |  |
LTIP Units [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |  |  |
2015 Performance Program [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Fair value granted |  | $ 10,914,000 |  |  |  |  |  |  |
Unrecognized compensation cost |  | $ 187,000 |  |  |  |  |  |  |
Performance measurement period, units forfeited |  | 1,109,358 |  |  |  |  |  |  |
2016 Performance Program [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Fair value granted |  |  |  |  | $ 10,520,000 |  |  |  |
Unrecognized compensation cost expected to be recognized over a weighted-average period |  |  |  |  | 1 year |  |  |  |
Unrecognized compensation cost |  |  |  |  | $ 1,135,000 |  |  |  |
Performance goals met in percentile based on relative index |  |  |  |  | 30th percentile |  |  |  |
Units, Granted |  |  |  | 1,085,244 |  |  |  |  |
Earned Units |  |  |  | 216,005 |  |  |  |  |
2016 Performance Program [Member] | Scenario Forecast [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Remaining units nonvested |  |  |  |  |  |  |  | 108,009 |
2016 Performance Program [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vested units | 107,996 |  |  |  |  |  |  |  |
2018 Performance Program [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |  |  |  |
Performance measurement period, term |  |  | 3 years |  |  |  |  |  |
Fair value of awards granted |  |  | $ 8,106,000 |  |  |  |  |  |
Performance measurement period, start date |  |  | Jan. 01, 2019 |  |  |  |  |  |
Performance measurement period, end date |  |  | Dec. 31, 2021 |  |  |  |  |  |
2018 Performance Program [Member] | Share-Based Compensation Award Tranche One [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Percentage of the awards that vest |  |  | 50.00% |  |  |  |  |  |
2018 Performance Program [Member] | Share-Based Compensation Award Tranche Two [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Percentage of the awards that vest |  |  | 50.00% |  |  |  |  |  |

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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -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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