Loan Agreement and Prior Term Loan Agreement - Additional Information (Detail) $ in Thousands				12 Months Ended
	Dec. 24, 2018 USD ($)	Jun. 22, 2017 USD ($)	May 09, 2016 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jun. 21, 2017 USD ($)
Line Of Credit Facility [Line Items]
Aggregate principal amount of term loan borrowed				$ 25,000		$ 50,000
Amortization of deferred issuance costs				298	$ 109	60
Term loan principal payment				32,500	6,250	$ 11,250
Term Loan Agreement [Member]
Line Of Credit Facility [Line Items]
Minimum liquidity requirement for capital stock repurchase		$ 15,000					$ 10,000
Term Loan Agreement [Member] | Quarter Ending March 31, 2018 [Member]
Line Of Credit Facility [Line Items]
Total consolidated leverage ratio, maximum		2.50
Term Loan Agreement [Member] | Quarters Ending On or After March 31, 2020 [Member]
Line Of Credit Facility [Line Items]
Total consolidated leverage ratio, maximum		1.50
Senior Secured Credit Facilities Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Interest expense				1,400	1,400
Amortization of deferred issuance costs				$ 300	100
Credit agreement bearing interest rate				Annual rate of 1.50%
Interest bearing rate			1.50%
LIBOR margin				plus 2.50
Term loan principal payment				$ 32,500	$ 6,300
Senior Secured Credit Facilities Credit Agreement [Member] | Federal Funds Effective Rate [Member]
Line Of Credit Facility [Line Items]
Applicable interest rate on borrowings			0.50%
Senior Secured Credit Facilities Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line Of Credit Facility [Line Items]
Debt instrument basis spread on variable rate			2.50%
Loan and Security Agreement [Member]
Line Of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	1.375%
Debt instrument payment frequency				quarterly
One time non-refundable facility fee	$ 25,000
Loan and Security Agreement [Member] | Maximum [Member]
Line Of Credit Facility [Line Items]
Percentage of capital stock pledge in foreign subsidiaries	65.00%
Loan and Security Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]
Line Of Credit Facility [Line Items]
Debt instrument basis spread on variable rate	2.00%
Loan and Security Agreement [Member] | Term Loan Agreement Year One and Two [Member]
Line Of Credit Facility [Line Items]
Debt instrument interest rate	1.25%
Loan and Security Agreement [Member] | Term Loan Agreement Year Three [Member]
Line Of Credit Facility [Line Items]
Debt instrument interest rate	1.88%
Loan and Security Agreement [Member] | Term Loan Agreement Year Four and Five [Member]
Line Of Credit Facility [Line Items]
Debt instrument interest rate	2.50%
Senior Secured Credit Facilities Credit Agreement [Member] | Term Loan Agreement [Member]
Line Of Credit Facility [Line Items]
Date the company entered into a Credit Agreement			May 09, 2016
Aggregate principal amount of term loan borrowed			$ 50,000
Debt instrument term loan			5 years
Western Alliance Bank [Member] | Loan and Security Agreement [Member]
Line Of Credit Facility [Line Items]
Aggregate principal amount of term loan borrowed	$ 25,000
Loan facility maturity date	Dec. 10, 2023