Income Taxes - Income Tax Expense Reconciliation (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Income taxes computed at the federal statutory rate	$ 146,544	$ 96,277	$ 72,652
State income taxes, net of federal income tax benefit	18,210	3,226	7,974
Other, net	(12,535)	(5,014)	(2,470)
Total	$ 152,219	$ 94,489	$ 78,156