Summary of Significant Accounting Policies - Additional Information (Detail) - Adoption of new accounting guidance $ in Millions |
Jan. 01, 2015
USD ($)
|
|---|---|
| Summary Of Significant Accounting Policies [Line Items] | |
| Reduction in consolidated assets | $ 8,000.0 |
| Reduction in consolidated liabilities | 4,700.0 |
| Redeemable NonControlling Interests in Consolidated Entities | |
| Summary Of Significant Accounting Policies [Line Items] | |
| Changes in assets and liabilities | 2,300.0 |
| Appropriated Partners' Capital | |
| Summary Of Significant Accounting Policies [Line Items] | |
| Changes in assets and liabilities | 90.9 |
| Non-Controlling Interests in Consolidated Entities | |
| Summary Of Significant Accounting Policies [Line Items] | |
| Changes in assets and liabilities | $ 1,000.0 |