Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred Tax Assets:
Basis adjustments (primarily as a result of the separation and recapitalization transactions that occurred during 2005 and from secondary offerings)	$ 739,059	$ 820,229
Compensation and benefits	250,413	243,564
Net operating loss and tax credit carryforwards	348,433	308,233
Depreciation and amortization	8,169	3,404
Other	58,273	30,626
Gross deferred tax assets	1,404,347	1,406,056
Valuation allowance	(1,225,305)	(1,238,765)
Deferred tax assets (net of valuation allowance)	179,042	167,291
Deferred Tax Liabilities:
Depreciation and amortization	19,296	33,715
Compensation and benefits	30,042	4,292
Goodwill	15,434	15,843
Other	70,394	50,648
Deferred tax liabilities	$ 135,166	$ 104,498