Other Assets - Components of Other Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid income taxes	$ 40,611	$ 0
Debt issuance costs, net of amortization	36,415	38,504
Prepaid expenses	33,141	21,427
Interest receivable	20,525	12,187
Identifiable intangible assets, net	19,511	21,564
Deferred tax assets	14,604	33,716
Service fee receivables	10,688	7,864
Other financial receivables	9,382	7,467
Receivable from seller	6,987	7,357
Security deposits	4,334	3,617
Recoverable legal fees	2,794	2,905
Funds held in escrow	0	16,889
Other	30,705	24,169
Total other assets	$ 229,697	$ 197,666