Debt - Additional Information (Detail) - USD ($)		6 Months Ended
	Sep. 15, 2015	Jun. 30, 2016
Debt Instrument [Line Items]
New credit agreement entering date	Sep. 15, 2015
Maximum increase in secured credit facility	$ 200,000,000
Interest rate on outstanding borrowings		Borrowings under the Credit Facility bear interest at a variable rate not less than zero based upon, at the Company’s option, either LIBOR or the higher of (i) the prime rate as published in the Wall Street Journal, and (ii) 0.5% plus the overnight federal funds rate, plus in each case, an applicable margin. The applicable margin for LIBOR loans, based on the applicable leverage ratio, is 1.25%, 1.50% or 1.75% per annum, and the applicable margin for base rate loans, based on the applicable leverage ratio, is either 0.25%, 0.50% or 0.75%% per annum. At June 30, 2016 our rate, inclusive of applicable margins, was 1.9% for LIBOR.
Outstanding borrowings under credit facility		$ 0
New Credit Agreement [Member]
Debt Instrument [Line Items]
Closing and legal fees		$ 1,000,000
Silicon Valley Bank [Member] | New Credit Agreement [Member]
Debt Instrument [Line Items]
Secured revolving credit facility term, years	5 years
Secured revolving credit facility, current borrowing capacity	$ 150,000,000
Percentage of fee payment on unused line of credit facility, lower end		0.20%
Percentage of fee payment on unused line of credit facility		0.25%
Percentage of fee payment on unused line of credit facility, higher end		0.30%
Maximum acquisition expense		$ 2,000,000
Period of calculating EBITDA (in month)		12 months
Percentage of equity interest in direct foreign subsidiaries pledged		65.00%
Credit facility financial covenants terms		(i) a maximum leverage ratio of consolidated total debt to consolidated adjusted EBITDA of 3.00 to 1.00, and (ii) a minimum fixed charge coverage ratio of 1.25 to 1.00. As of June 30, 2016, our leverage ratio was 0.00 1.00 and our fixed charge ratio was 4.31 1.00.
Leverage ratio		0.00%
Fixed charge ratio		4.31%
Silicon Valley Bank [Member] | New Credit Agreement [Member] | Minimum [Member]
Debt Instrument [Line Items]
Secured revolving credit facility, minimum variable rate		0.00%
Wells Fargo Capital Finance, LLC [Member] | Original Credit Agreement [Member]
Debt Instrument [Line Items]
Secured revolving credit facility, current borrowing capacity	$ 120,000,000
Secured revolving credit facility, expiration date	Jul. 13, 2016
Federal Funds Rate [Member]
Debt Instrument [Line Items]
Interest rate on outstanding borrowings		0.5% plus the overnight federal funds rate
LIBOR Rate [Member]
Debt Instrument [Line Items]
Credit facility basis spread on variable rate LIBOR		0.50%
Variable interest rate		1.90%
LIBOR Rate [Member] | Silicon Valley Bank [Member] | New Credit Agreement [Member]
Debt Instrument [Line Items]
Applicable leverage ratio, lower end		1.25%
Applicable leverage ratio		1.50%
Applicable leverage ratio, higher end		1.75%
Base Rate [Member] | Silicon Valley Bank [Member] | New Credit Agreement [Member]
Debt Instrument [Line Items]
Applicable leverage ratio, lower end		0.25%
Applicable leverage ratio		0.50%
Applicable leverage ratio, higher end		0.75%