Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax [Line Items]
Deferred tax asset pertaining to basis step-up for payments made under the tax receivable agreement	$ 6,694	$ 6,974
Valuation allowance amount	1,238,765	1,145,257
Net increase in valuation allowance	93,508
Indefinite-lived net operating loss and tax credit carryforwards	54,442
Net operating loss and tax credit carryforwards	228,790
Operating loss and tax credit carryforwards begin to expire	2029
Deferred tax assets pertaining to tax deductions related to equity compensation in excess of compensation recognized for financial reporting	19,900	19,900
Decrease in deferred tax assets for unrecognized tax benefits	8,500
Basic step-up assets	705,000
Net operating losses due to amortization of step-up assets	196,000
Provision (benefit) pursuant to tax receivable agreement		429	2,361
LFCM Holdings [Member]
Income Tax [Line Items]
Percentage of cash savings required to pay under the tax receivable agreement	85.00%
Separation And Recapitalization [Member]
Income Tax [Line Items]
Basis adjustments relating to deferred tax assets for purchases and redemptions of historical and working members interests	158,459	176,871
Exchangeable Interests And Secondary Offerings [Member]
Income Tax [Line Items]
Deferred tax asset basis adjustments as a resulting from exchange of exchangeable interests and secondary offerings	638,993	638,069
Tax Basis Step Up On Certain U.K. Assets [Member]
Income Tax [Line Items]
Deferred tax asset basis adjustments on certain U.K. assets	16,083	24,338
Related Party Payables [Member]
Income Tax [Line Items]
Provision (benefit) pursuant to tax receivable agreement		$ 2,790