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Schedule I - Parent Company Only Financial Statements - Statements of Cash Flows (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | $ (12,744) | $ 9,904 | $ 39,273 | $ 20,169 | $ (33,475) | $ (1,553) | $ 22,307 | $ 84,974 | $ 59,442 | $ 69,346 | $ 56,602 | $ 72,253 | $ 286,610
Adjustments to reconcile net income to net cash used in operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in net gains (losses) of unconsolidated investments | (1,354) | (1,527) | (1,119) | (1,023) | (1,064) | $ (1,530) | $ (738) | (783) |  |  | (5,023) | (4,115) | (7,377)
Deferred tax (benefit) expense |  |  |  | 2,686 |  |  |  |  | 2,622 | 6,798 | (16,549) | (4,196) | (23,737)
Decrease (increase) in operating assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables from related parties |  |  |  |  |  |  |  |  |  |  | 5,427 | (4,215) | 37,506
Other assets |  |  |  | (7,928) |  |  |  |  | 2,116 | (15,099) | (20,070) | 5,239 | (25,343)
(Decrease) increase in operating liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable, accrued and other liabilities |  |  |  | (44,770) |  |  |  |  | (78,249) | (39,488) | 57,791 | (17,878) | 51,003
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  |  | 304,263 | 239,062 | (67,345)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash provided by (used in) investing activities |  |  |  |  |  |  |  |  |  |  | (77,592) | (40,602) | 9,236
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  |  |  |  |  |  |  |  |  | (60,440) | (192,442) | (231,446)
Repurchase of Class A common stock |  |  |  |  |  |  |  |  |  |  | (6) | (1,236) | (10,439)
Proceeds from issuance of Class A common stock, net of costs |  |  |  |  |  |  |  |  |  |  |  |  | 327,624
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  |  | (13,101) | 18,246 | 50,888
Net cash provided by (used in) operating activities from discontinued operations |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (748,231)
Net cash provided by (used in) investing activities from discontinued operations |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 18,347
Net cash provided by (used in) financing activities from discontinued operations |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 367,931
Net increase (decrease) in Cash and cash equivalents, and Cash segregated under regulatory requirements |  |  |  | 21,248 |  |  |  |  | 50,886 | 100,419 | 214,563 | 219,336 | (380,012)
Cash and cash equivalents, and Cash segregated under regulatory requirements at beginning of period | 736,533 | 687,000 | 657,362 | 636,114 |  |  |  | 416,778 | 636,114 | 636,114 | 636,114 | 416,778 | 796,790
Cash and cash equivalents, and Cash segregated under regulatory requirements at end of period | 850,677 | $ 736,533 | $ 687,000 | 657,362 | 636,114 |  |  |  | 687,000 | 736,533 | 850,677 | 636,114 | 416,778
Supplemental cash information: |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid during the period for interest |  |  |  |  |  |  |  |  |  |  | 69,572 | 51,776 | 41,951
Supplemental non-cash information: |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Class A common stock upon exchange of limited partnership interests |  |  |  |  |  |  |  |  |  |  | 11,388 | 26,146 | 143,232
Issuance of Class A and contingent Class A common stock and limited partnership interests for acquisitions |  |  |  |  |  |  |  |  |  |  | 1,578 | 3,040 | 21,899
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders |  |  |  |  |  |  |  |  |  |  | 48,908 | 47,562 | 202,196
Less: Equity income of discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  | (125,341)
Adjustments to reconcile net income to net cash used in operating activities: |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of deferred financing costs |  |  |  |  |  |  |  |  |  |  | 4,188 | 3,206 | 4,012
Equity in net gains (losses) of unconsolidated investments |  |  |  |  |  |  |  |  |  |  | (41,876) | (50,413) | (49,087)
Deferred tax (benefit) expense |  |  |  |  |  |  |  |  |  |  | (13,585) | (20,042) | (12,449)
Decrease (increase) in operating assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in subsidiaries |  |  |  |  |  |  |  |  |  |  | (11,480) | 12,400 | (368,509)
Receivables from related parties |  |  |  |  |  |  |  |  |  |  | 1,241 | 16,029 | 10,686
Note receivable from related party |  |  |  |  |  |  |  |  |  |  | (187,069) | (366,496) | (450,000)
Other assets |  |  |  |  |  |  |  |  |  |  | 887 | 861 | 39
(Decrease) increase in operating liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts payable, accrued and other liabilities |  |  |  |  |  |  |  |  |  |  | 14,295 | (4,125) | 3,321
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  |  | (184,491) | (361,018) | (785,132)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  |  |  |  |  |  |  |  |  | (60,440) | (192,442) | (231,446)
Repurchase of Class A common stock |  |  |  |  |  |  |  |  |  |  | (5) | (970) | (8,185)
Issuance of senior notes, net of deferred issuance costs |  |  |  |  |  |  |  |  |  |  | 294,396 | 294,845 | 444,196
Unsecured revolving credit agreement borrows |  |  |  |  |  |  |  |  |  |  | 230,000 | 390,000 | 195,000
Unsecured revolving credit agreement repayments |  |  |  |  |  |  |  |  |  |  | (300,000) | (320,000) | (195,000)
Distributions from subsidiaries |  |  |  |  |  |  |  |  |  |  | 61,972 | 184,545 | 199,062
Proceeds from issuance of Class A common stock, net of costs |  |  |  |  |  |  |  |  |  |  | 2,516 | 4,929 | 345,974
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  |  |  | 184,471 | 360,907 | 749,601
Repayments of senior notes |  |  |  |  |  |  |  |  |  |  | 43,968 |  |
Net cash provided by (used in) financing activities from discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  | 35,487
Net increase (decrease) in Cash and cash equivalents, and Cash segregated under regulatory requirements |  |  |  |  |  |  |  |  |  |  | (20) | (111) | (44)
Cash and cash equivalents, and Cash segregated under regulatory requirements at beginning of period |  |  |  | $ 44 |  |  |  | $ 155 | $ 44 | $ 44 | 44 | 155 | 199
Cash and cash equivalents, and Cash segregated under regulatory requirements at end of period | $ 24 |  |  |  | $ 44 |  |  |  |  |  | 24 | 44 | 155
Supplemental cash information: |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid (refund) during the period for taxes |  |  |  |  |  |  |  |  |  |  | (5,919) | 5,422 | 20,598
Cash paid during the period for interest |  |  |  |  |  |  |  |  |  |  | 60,594 | 47,329 | 15,375
Supplemental non-cash information: |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of Class A common stock upon exchange of limited partnership interests |  |  |  |  |  |  |  |  |  |  | 11,388 | 26,146 | 143,232
Issuance of Class A and contingent Class A common stock and limited partnership interests for acquisitions |  |  |  |  |  |  |  |  |  |  | $ 1,578 | $ 3,040 | $ 21,899

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