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Convertible Debentures and Credit Arrangements - Credit Arrangements Narrative (Detail) - Credit Arrangements
3 Months Ended
Mar. 31, 2017
USD ($)
Debt Instrument [Line Items]  
Maximum aggregate amount of revolving credit facility in the form of borrowings, guarantees and issuances of letters of credit (subject to a $20 million sublimit) $ 25,000,000.0
After Amendment  
Debt Instrument [Line Items]  
Credit facility maturity date Dec. 19, 2016
Landlord Of Compu Com Systems Incs Dallas Headquarters  
Debt Instrument [Line Items]  
Letter of credit under the credit facility $ 6,300,000
Letter of credit expiration date Mar. 19, 2019