Income Taxes - Reconciliation of Federal Statutory Rate to Effective Income Tax Rate on Continuing Operations (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
State, net of federal benefit	4.00%	5.00%	10.00%
Recognition of previously unrecognized tax benefits	(15.00%)	0.00%	0.00%
State rate change due to acquisition	0.00%	(2.00%)	0.00%
Acquisition costs	0.00%	4.00%	0.00%
Noncontrolling interests	(5.00%)	(7.00%)	(6.00%)
Charitable contributions	0.00%	0.00%	(6.00%)
Oil and gas percentage depletion	(2.00%)	(5.00%)	(8.00%)
Other	0.00%	1.00%	0.00%
Effective tax rate	17.00%	31.00%	25.00%