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Reconciliation between Federal Statutory Rate and Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Statutory Federal Tax Rate [Line Items]
Federal statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal income tax benefit	2.50%	3.00%	2.90%
Nondeductible transaction costs		0.20%
Divestiture Gain	0.30%
Other items	0.40%	0.10%	0.40%
Impact of income attributable to noncontrolling interests	(1.90%)	(2.30%)	(2.80%)
Effective tax rate	36.30%	36.00%	35.50%

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Effective income tax rate reconciliation impact of income attributable to noncontrolling interest.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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