Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Effective Tax Rate (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Apr. 14, 2014	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2015
Income Tax [Line Items]
Recognition of net deferred tax liabilities upon C-corporation conversion	$ 321,100	$ 321,100	$ 321,054
Total Deferred Tax Liabilities		462,300	456,480	$ 438,957
Deferred tax assets		$ 14,000	339,750	$ 353,588
One Time Expense [Member]
Income Tax [Line Items]
Recognition of net deferred tax liabilities upon C-corporation conversion			321,100
Total Deferred Tax Liabilities			462,300
Deferred tax assets			14,000
Tax benefit			$ 127,200