Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Effective tax rates (as a percent)	26.40%	32.00%
Expiration period of tax holiday	6 years
Effective tax rate in Philippines post tax exemption (as a percent)	5.00%
Effect of diluted earnings per share, tax holiday (in dollars per share)	$ 0.12	$ 0.09	$ 0.10
Operating loss carryforward valuation allowance	$ 351,000	$ 512,000
Valuation allowance related to tax credit carry forward	103,000	83,000
Deferred income taxes provided for Company's share of undistributed net earnings of foreign operations	0	0
Undistributed net earnings of foreign operations	315,486,000	261,804,000
Unrecognized tax benefits	3,087,000	2,797,000
Recognized interest and penalties	315,000	205,000
Accrued interest on unrecognized tax benefits	$ 1,553,000	1,269,000
First Five Years
Income Taxes [Line Items]
Tax exemption on profit (as a percent)	100.00%
Five to Ten Years
Income Taxes [Line Items]
Tax exemption on profit (as a percent)	50.00%
Expiration 2032
Income Taxes [Line Items]
Operating loss carryforwards	$ 4,052,000	$ 9,063,000
Operating loss carry forwards expiration date (year)	2032