Income Taxes - Schedule of Reconciliation of Income Tax Provision and Statutory Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Tax expense (benefit) at statutory rate	$ 494	$ (11,525)	$ (1,083)
Increase (decrease) in tax resulting from:
State income tax, net of federal benefit	367	174	34
Domestic production activities deduction	(235)	(561)	(211)
Intangible asset and goodwill impairment	1,789	17,859
Change in uncertain tax position reserves	465	(624)	(1,281)
Permanent differences	1,026	(31)	1,162
Impact of rate differences and adjustments	(20)	(1,655)	(1,489)
United States and foreign tax incentives	(240)	(1,035)	(883)
Non-deductible transaction costs		7	1,356
Earnout (income) expense	(1,779)	2,573	3,928
Change in valuation allowance	1,044	222	483
Audit settlements			65
Provision-to-return adjustments	(495)	108	808
Revaluation of deferred tax assets and liabilities	(4,819)
Net deemed dividend on repatriation of foreign earnings	6,426
Other	415	(222)	(251)
Income tax provision from continuing operations	$ 4,438	$ 5,290	$ 2,638