Fair Value Measurements - Information about Valuation Inputs for Variable Interest Entity Assets and Liabilities Classified as Level 3 (Detail) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2017

Sep. 30, 2016

Sep. 30, 2017

Sep. 30, 2016

Jun. 30, 2017

Dec. 31, 2016

Jun. 30, 2016

Dec. 31, 2015

Fair Value, Inputs, Level 3 [Member] | European ABS Transactions [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Of Consolidated Variable Interest Entity Debt Obligations Valued Using Unobservable Inputs By Asset Class

$ 2,551,278

Fair Value, Inputs, Level 3 [Member] | US Commercial ABS Transaction [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Of Consolidated Variable Interest Entity Debt Obligations Valued Using Unobservable Inputs By Asset Class

30,942

Fair Value, Inputs, Level 3 [Member] | Successor [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

$ 12,232,247

$ 12,363,248

$ 12,232,247

$ 12,363,248

$ 12,044,498

11,369,112

$ 12,021,381

$ 11,497,098

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings

66,569

622,065

410,104

1,244,712

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss

332,207

(216,229)

934,431

(1,326,847)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases

7,126

35,781

99,018

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales

(79,319)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

(211,027)

(71,095)

(459,940)

(10,571)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three

22,078

100,798

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three

(737,898)

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

58,097

606,031

327,787

1,201,113

Fair Value, Inputs, Level 3 [Member] | Successor [Member] | Investments [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

775,809

752,474

775,809

752,474

765,682

762,703

722,670

488,884

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings

8,330

15,804

34,628

42,823

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss

8,557

12,334

25,654

35,570

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases

7,126

35,781

99,018

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales

(79,319)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

(6,760)

(5,460)

(25,716)

14,619

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three

22,078

100,798

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

Fair Value, Inputs, Level 3 [Member] | Successor [Member] | European ABS Transactions [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Of Consolidated Variable Interest Entity Debt Obligations Valued Using Unobservable Inputs By Asset Class

2,914,985

Fair Value, Inputs, Level 3 [Member] | Successor [Member] | US Commercial ABS Transaction [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Of Consolidated Variable Interest Entity Debt Obligations Valued Using Unobservable Inputs By Asset Class

31,399

Fair Value, Inputs, Level 3 [Member] | Successor [Member] | Other Assets [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

6,337

7,729

6,337

7,729

6,691

7,382

8,687

8,696

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings

(354)

(958)

(1,045)

(967)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

(354)

(958)

(1,045)

(967)

Fair Value, Inputs, Level 3 [Member] | Successor [Member] | Derivative Financial Instruments, Liabilities [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

53,089

(119,106)

53,089

(119,106)

(100,282)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings

53,329

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

100,042

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

5,640

Loan Origination Commitments [Member] | Fair Value, Inputs, Level 3 [Member] | Successor [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

11,476,766

Long-term Debt [Member] | Fair Value, Inputs, Level 3 [Member] | Successor [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

(2,583,300)

Derivative Financial Instruments, Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] | Successor [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

(99,192)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings

(23,250)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

(3,336)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

(24,026)

Derivative Financial Instruments, Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] | Successor [Member] | Derivative Financial Instruments, Liabilities [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

53,089

(119,106)

53,089

(119,106)

52,729

(104,032)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings

2,031

(12,220)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

(1,671)

(2,854)

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

1,889

(12,450)

Investment Contracts [Member] | Fair Value, Inputs, Level 3 [Member] | Successor [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

2,828,685

Variable Interest Entity, Primary Beneficiary [Member] | Successor [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

323,192

1,226,106

Variable Interest Entity, Primary Beneficiary [Member] | Fair Value, Inputs, Level 3 [Member] | Successor [Member] | Loans Receivable [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

11,690,324

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings

1,367,063

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss

(1,385,893)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

194,728

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

1,367,063

Variable Interest Entity, Primary Beneficiary [Member] | Fair Value, Inputs, Level 3 [Member] | Successor [Member] | Corporate Debt Securities [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

2,588,556

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings

571,739

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss

(331,610)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

571,739

Variable Interest Entity, Primary Beneficiary [Member] | Loan Origination Commitments [Member] | Fair Value, Inputs, Level 3 [Member] | Successor [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

11,557,788

10,658,963

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings

515,904

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss

913,477

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

(530,556)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

515,904

Variable Interest Entity, Primary Beneficiary [Member] | Loan Origination Commitments [Member] | Fair Value, Inputs, Level 3 [Member] | Successor [Member] | Loans Receivable [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

11,557,788

11,476,766

11,557,788

11,476,766

11,301,298

11,074,772

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings

137,513

690,431

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss

327,087

(221,934)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

(208,110)

(66,503)

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

137,513

690,431

Variable Interest Entity, Primary Beneficiary [Member] | Long-term Debt [Member] | Fair Value, Inputs, Level 3 [Member] | Successor [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

(2,946,384)

(2,583,300)

(2,946,384)

(2,583,300)

(2,804,218)

(2,582,220)

(2,258,009)

$ (3,180,170)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings

(62,887)

(378,139)

(143,194)

(712,696)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss

(84,793)

49,126

(233,187)

355,086

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

5,514

3,722

12,217

(216,582)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three

(737,898)

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

(62,887)

(378,139)

(143,194)

(712,696)

Variable Interest Entity, Primary Beneficiary [Member] | Investment Contracts [Member] | Fair Value, Inputs, Level 3 [Member] | Successor [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

2,785,608

$ 2,622,566

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings

(49,518)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss

228,487

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Purchases

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Sales

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements

(15,927)

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Into Level Three

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Transfers Out Of Level Three

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

(49,518)

Variable Interest Entity, Primary Beneficiary [Member] | Investment Contracts [Member] | Fair Value, Inputs, Level 3 [Member] | Successor [Member] | Corporate Debt Securities [Member]

Fair Value Inputs, Liabilities, Quantitative Information [Line Items]

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability

2,785,608

2,828,685

$ 2,785,608

$ 2,828,685

$ 2,722,316

$ 2,577,293

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings

(18,064)

307,147

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss

81,356

(55,755)

Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held

$ (18,064)

$ 307,147