Summary of Significant Accounting Policies - Acquisition Related Expenses and Merger and other Transaction Related Expenses (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Accounting Policies [Abstract]
Strategic advisory services	$ 32,615		$ 10,299
Transfer taxes	5,109		1,085
Legal fees and expenses	2,984		1,680
Multi-tenant spin off	2,321
Other fees and expenses	1,330		2,865
Personnel costs and other reimbursements	751		384
Subordinated distribution fees	78,244		98,360
Post-transaction support services	14,251		2,000
Furniture, fixtures and equipment	14,085		5,800
Legal fees and expenses	1,826		950
Personnel costs and other reimbursement	2,443
Other fees and expenses	4,339		145
Total	$ 160,298	[1],[2]	$ 123,568	[1],[2]

[1] For discussion on the restatement adjustments, see Note 2 - Restatement of Previously Issued Financial Statements.

[2] This line item caption has been updated to merger and other non-routine transactions in the accompanying consolidated statements of operations.