Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Federal corporate income tax rate		35.00%	34.00%	34.00%
Net tax benefit		$ 51,800,000
Effective tax rate on non deductible expense		134.20%	50.00%	40.30%
Deferred tax asset valuation allowance change in amount net		$ 3,500,000	$ 1,700,000
Deferred tax asset valuation allowance amount decrease			200,000
Valuation allowance on foreign tax credits				$ 2,400,000
Amount of unrecognized tax benefits would, if recognized, impact effective tax rate		5,700,000
Interest accrued on income taxes		1,000,000
Impact of these tax holidays decreased foreign taxes		$ 800,000	$ 700,000	$ 200,000
Benefit of the tax holidays on net income per share (diluted)		$ 0.03	$ 0.03	$ 0.01
Scenario, Plan [Member]
Income Taxes [Line Items]
Federal corporate income tax rate	21.00%
State Net Operating Loss Carryforwards [Member]
Income Taxes [Line Items]
Deferred tax asset valuation allowance amount increase		$ 2,300,000	$ 1,900,000
Foreign Net Operating Loss Carryforwards [Member]
Income Taxes [Line Items]
Deferred tax asset valuation allowance amount increase		1,200,000
Amount of unrecognized tax benefits would, if recognized, impact effective tax rate		5,200,000
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Interest accrued on income taxes		200,000
NOL carryovers		26,600,000
Tax credits in foreign jurisdictions		$ 18,000,000
Tax credits in foreign jurisdictions expiration beginning year		2026
Foreign Tax Authority [Member] | Maximum [Member]
Income Taxes [Line Items]
Interest accrued on income taxes			100,000	$ 100,000
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Interest accrued on income taxes			$ 200,000	$ 300,000
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
NOL carryovers		$ 81,400,000
NOL carryovers expiration beginning year		2030