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Difference Between Statutory Federal Income Tax Rate and Effective Income Rate (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory tax rate	21.00%	35.00%	35.00%
State income taxes - net of the federal income tax benefit	1.20%	1.90%	2.00%
Goodwill impairment	(6.90%)
Permanent differences	(0.60%)	(1.30%)	(0.10%)
Tax effects of tax reform	(1.30%)	66.70%
Share-based payments	(0.10%)	3.60%
Acquisition related differences		(3.30%)
Valuation allowance	(3.70%)
State deferred tax remeasurement	2.30%
Other differences, net	0.60%	(0.80%)	(1.10%)
Effective tax rate	12.50%	101.80%	35.80%

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Items that are deductible or taxable for tax purposes only. These items are not treated as revenue or expense for book purposes.

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