Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified		12 Months Ended					1 Months Ended
	Dec. 31, 2008 MIG Earnout Notes	Dec. 31, 2012 Credit Facility	Dec. 31, 2012 Credit Facility Amendment One	Dec. 31, 2012 Credit Facility Amendment Two	Dec. 31, 2012 Credit Facility Amendment Three	Dec. 31, 2012 Credit Facility Amendment Four	Dec. 31, 2008 Special Termination Benefits Shareholder
Debt Instrument [Line Items]
Aggregate principal amount payable to the former MIG shareholders	$ 20,000						$ 5,000
Number of former employees to whom Special Bonus Notes							2
Date of amendment			Aug. 01, 2009	Feb. 01, 2010	Mar. 01, 2010	Feb. 01, 2011
Date of maturity of Credit Facility		Jun. 30, 2011
Borrowing base of the Company's eligible accounts receivable		80.00%
Credit Facility provided for borrowings, Maximum		$ 8,000