Debt - Additional Information (Detail) (USD $)				0 Months Ended			0 Months Ended				0 Months Ended					0 Months Ended
	Jun. 30, 2013 Senior Unsecured Credit Facilities	Jun. 30, 2013 Senior Unsecured Credit Facilities Maximum	Jun. 30, 2013 Senior Unsecured Credit Facilities Minimum	Feb. 12, 2010 Loan and security agreement with Silicon Valley Bank Minimum Less than $10,000 of cash equivalents in accounts with the Lender in excess of borrowings	Feb. 12, 2010 Loan and security agreement with Silicon Valley Bank Revolver	Feb. 12, 2010 Loan and security agreement with Silicon Valley Bank Term Loan	Feb. 12, 2010 Loan and security agreement with Silicon Valley Bank Term Loan Maximum borrowings	Feb. 12, 2010 Loan and security agreement with Silicon Valley Bank Foreign Subsidiaries	Feb. 12, 2010 Loan and security agreement with Silicon Valley Bank Senior Secured Credit Facility Maximum $15,000 minimum trailing-four-quarter cash-flow covenant	Feb. 12, 2010 Loan and security agreement with Silicon Valley Bank Senior Secured Credit Facility Minimum	Mar. 30, 2011 Amended Loan Agreement	Mar. 30, 2011 Amended Loan Agreement Minimum	Feb. 12, 2010 Amended Loan Agreement Minimum	Mar. 30, 2011 Amended Loan Agreement Revolver	Feb. 12, 2010 Amended Loan Agreement Revolver	Mar. 30, 2011 Amended Loan Agreement Senior Secured Credit Facility Thereafter	Oct. 12, 2012 KeyBank National Association Senior Unsecured Credit Facilities
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 15,000,000	$ 20,000,000								$ 35,000,000	$ 35,000,000		$ 200,000,000
Debt instrument borrowing period					2 years												5 years
Number of term loan borrowings							3
Credit Agreement accordion feature, incremental revolver or term loan amount	50,000,000
Leverage Ratio		3.50
Interest Coverage Ratio			3
Remaining borrowing capacity	35,780,000
Borrowings outstanding	0
Amount of outstanding letter of credit	3,853,000
Percentage of voting stock of foreign subsidiaries								65.00%
Quick Ratio										1.5		1.0	1.0
Cash equivalents in accounts with the Lender in excess of borrowings									10,000,000
Minimum trailing-four-quarter cash-flow covenant				$ 15,000,000							$ 15,000,000					$ 17,500,000