Debt (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Placement	Jun. 30, 2012	Dec. 31, 2012
Debt obligations [Abstract]
Revolving credit agreement	$ 53,543		$ 53,543		$ 52,495
Other	471		471		1,190
Total	82,086		82,086		82,986
Less amounts due in one year or less	(3,543)		(3,543)		(4,262)
Total	78,543		78,543		78,724
Number of private placements of debt			2
Senior notes interest rate, minimum (in hundredths)			8.90%
Senior notes interest rate, maximum (in hundredths)			8.98%
Line of Credit Facility [Line Items]
Multiemployer pension withdrawal liability	31,683		31,683
Deferred Financing Fees [Abstract]
Unamortized deferred financing fees	804		804
Amortization of deferred financing fees	67	70	129	165
Brandimage French subsidiary [Member]
Line of Credit Facility [Line Items]
Notes payable	3		3
Swing-line Loan [Member]
Line of Credit Facility [Line Items]
Multicurrency revolving credit facility, maximum borrowing capacity	10,000		10,000
Credit Agreement 2012 [Member]
Line of Credit Facility [Line Items]
Term of revolving credit facility			5 years
Multicurrency revolving credit facility, maximum borrowing capacity	125,000		125,000
Optional increase in amount of Credit Agreement, maximum	50,000		50,000
Minimum number of new commitments to be obtained to increase the Credit Agreement			1
Maximum basis spread on LIBOR borrowings (in hundredths)	2.25%		2.25%
Basis spread on reference rate (in hundredths)			1.75%
LIBOR Borrowing [Member]
Line of Credit Facility [Line Items]
Amount outstanding	37,500		37,500
Interest rate (in hundredths)	2.41%		2.41%
Prime Rate Borrowings [Member]
Line of Credit Facility [Line Items]
Basis spread on reference rate (in hundredths)			1.50%
Amount outstanding	13,000		13,000
Interest rate (in hundredths)	4.50%		4.50%
Prime Rate Borrowings [Member] | Canadian Subsidiary [Member]
Line of Credit Facility [Line Items]
Amount outstanding	856		856
Interest rate (in hundredths)	4.25%		4.25%
Bankers Acceptance Agreements Borrowing [Member] | Canadian Subsidiary [Member]
Line of Credit Facility [Line Items]
Amount outstanding	2,187		2,187
Interest rate (in hundredths)	3.55%		3.55%
Software License Agreement Financing [Member]
Line of Credit Facility [Line Items]
Amount outstanding	252		252
New borrowings			906
Period of debt instrument			3 years
Agreement expiration date			Sep. 30, 2014
Equipment and Software Maintenance [Member]
Line of Credit Facility [Line Items]
Amount outstanding	216		216
New borrowings			649
Period of debt instrument			3 years
Agreement expiration date			Dec. 31, 2013
Private shelf facility agreement [Member]
Line of Credit Facility [Line Items]
Multicurrency revolving credit facility, maximum borrowing capacity	75,000		75,000
Maximum number of maturities years under Shelf Facility			10 years
Notice period to terminate the unused portion			30 days
Period of debt instrument			3 years
Series F Senior Note [Member]
Line of Credit Facility [Line Items]
Debt instrument, face amount	25,000		25,000
Debt instrument, interest rate, stated percentage (in hundredths)	4.38%		4.38%
Debt instrument, maturity date			Jan. 27, 2019
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Multicurrency revolving credit facility, maximum borrowing capacity	10,000		10,000
Series A senior note payable - Tranche A [Member]
Debt obligations [Abstract]
Senior note payable	1,843		1,843		1,843
Series A senior note payable - Tranche B [Member]
Debt obligations [Abstract]
Senior note payable	1,229		1,229		2,458
Series A senior note payable - Tranche A & Tranche B [Member]
Debt obligations [Abstract]
Current amount of long-term debt	3,072		3,072
Series F senior note payable [Member]
Debt obligations [Abstract]
Senior note payable	$ 25,000		$ 25,000		$ 25,000