Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Significant Accounting Policies [Line Items]
Foreign currency remeasurement gains (losses), net	$ (2,887)	$ (761)	$ 1,406
Cash and cash equivalents maturity period	90 days or less
Depreciation and amortization expense	34,750	30,855	24,580
Annual date of goodwill impairment	Nov. 01, 2013	Dec. 31, 2012
Collateralized borrowing activities	0	13,854
Reimbursements of expenses	$ 18,327	$ 24,762	$ 18,942
Minimum [Member]
Significant Accounting Policies [Line Items]
A deferred tax asset is recognized if it is more likely than not (defined as a likelihood of greater than 50%) that a tax benefit will be accepted by a taxing authority.	50.00%
Financial Advisory [Member]
Significant Accounting Policies [Line Items]
Fees receivable outstanding past due	60 days
Contractual payment term description relating to our interest-bearing financing receivables	Financial Advisory transactions include specific contractual payment terms that may vary from one month to four years.
Days fee receivables are considered past due in excess	180 days
Asset Management [Member]
Significant Accounting Policies [Line Items]
Fees receivable outstanding past due	12 months