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Income Taxes - Reconciliation of Statutory Federal Income Tax Rate and Company's Effective Rate (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
Change in valuation allowance	8.16%	0.90%	(27.74%)
State income tax rate, net of federal benefit	4.17%	4.11%	1.55%
Acquisition expense	4.06%	0.61%
Goodwill impairment	1.16%
Foreign tax differential	0.68%	0.82%	0.82%
Change in effective state rate	0.22%	(0.06%)	6.86%
Other differences, net	(0.52%)	0.27%	0.50%
Effective rate	52.93%	41.65%	16.99%

X

- Definition

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

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