Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Income Tax [Line Items]
Provisions (benefits) for income taxes		$ (1,176,531)	$ 13,071	$ (1,164,514)	$ 34,822
Effective income tax rates		146.80%	13.20%	160.20%	16.90%
U.S. federal statutory income tax rate				35.00%
Deferred tax benefit		$ 821,000		$ 1,195,319	$ (2,274)
Deferred tax benefit related to tax receivable agreement		378,000
Deferred tax assets, subject to Tax Receivable Agreement		1,177,000		$ 1,177,000
Tax receivable agreement, expiration terms				The term of the Amended and Restated Tax Receivable Agreement will continue until approximately 2033 or, if earlier, until all relevant tax benefits have been utilized or expired.
Liability accrued related to Amended and Restated Tax Receivable Agreement		961,948	$ 9,240	$ 968,483	$ 9,240
Subsequent Event [Member]
Income Tax [Line Items]
Percentage of beneficial interests purchased in trust	46.90%
Payments to purchase beneficial interest in trust	$ 42,222
Increase in net income due to extinguishment of Amended and Restated Tax Receivable Agreement and related reduction of deferred tax assets	$ 290,000
LMDC Holdings [Member]
Income Tax [Line Items]
Percentage of cash savings provides for payment under the Amended and Restated Tax Receivable Agreement				85.00%
Liability accrued related to Amended and Restated Tax Receivable Agreement		961,948		$ 968,483
Cumulative liability related to Amended and Restated Tax Receivable Agreement		$ 988,085		$ 988,085		$ 19,577