Long-Term Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Oct. 31, 2011
Schedule Of Debt Instruments [Line Items]
Interest rate	1.25%
Promissory note payable period	2013-11
Imputed interest rate used to discount	2.00%
Credit Agreement Amendment
Schedule Of Debt Instruments [Line Items]
Percentage of stock of non-U.S. subsidiaries pledged	65.00%
Credit Agreement Amendment | Minimum
Schedule Of Debt Instruments [Line Items]
Maximum borrowing amount		$ 30,000
Credit Agreement Amendment | Maximum
Schedule Of Debt Instruments [Line Items]
Maximum borrowing amount		40,000
Term loan
Schedule Of Debt Instruments [Line Items]
Maximum borrowing amount		10,000
Period of credit agreement	5 years
Quarterly installments payment	500
Quarterly installments payment starting date	Dec. 01, 2011
Libor-based variable interest rate of term loan	2.20%
Effective fixed rate on term loan	2.90%
Revolving loan
Schedule Of Debt Instruments [Line Items]
Maximum borrowing amount		$ 30,000
Period of credit agreement	5 years
Revolving loan | Minimum
Schedule Of Debt Instruments [Line Items]
Interest rate on revolving loan, percentage added to Libor	0.75%
Commitment fee	0.10%
Revolving loan | Maximum
Schedule Of Debt Instruments [Line Items]
Interest rate on revolving loan, percentage added to Libor	1.75%
Commitment fee	0.25%