Financing Arrangements (Asset Based Revolving Credit Facility) - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Asset-based credit facility, maximum borrowing capacity	$ 230,000,000
Amount outstanding under letters of credit	1,278,000
Asset-backed credit facility	0
Cash and cash equivalents	37,399,000	52,003,000	59,139,000	43,023,000
Debt instrument maximum additional borrowing capacity amount	47,607,000
Average outstanding borrowing	41,119,000
Average available liquidity	91,318,000
Asset-based credit facility, maturity date	Jun. 30, 2016
Borrowing base availability	25,000,000
Asset-based credit facility, interest rate	6.20%
Asset-based credit facility, origination fees	4,292,000
Unamortized origination fees	2,515,000	3,171,000
Asset-based credit facility, origination fees included in other current assets	915,000	906,000
Asset-based credit facility, origination fees included in other long-term assets	1,600,000	2,265,000
Minimum
Debt Instrument [Line Items]
Asset-based credit facility, monthly fees	0.375%
Maximum
Debt Instrument [Line Items]
Asset-based credit facility, monthly fees	0.50%
Scenario 1
Debt Instrument [Line Items]
Applicable margin rate reduction	All applicable margins may be permanently reduced by 0.25% if EBITDA meets or exceeds $25,000,000 over any trailing twelve month period
Line of credit facility conditional reduction in margin rate	0.25%
Scenario 1 | Minimum
Debt Instrument [Line Items]
Amount of EBIDTA to reduce applicable margin	25,000,000
Scenario 2
Debt Instrument [Line Items]
Applicable margin rate reduction	reduced by an additional 0.25% if EBITDA meets or exceeds $50,000,000 over any trailing twelve month period
Line of credit facility conditional reduction in margin rate	0.25%
Scenario 2 | Minimum
Debt Instrument [Line Items]
Amount of EBIDTA to reduce applicable margin	50,000,000
United States
Debt Instrument [Line Items]
Asset-based credit facility, maximum borrowing capacity	158,333,000
Canada
Debt Instrument [Line Items]
Asset-based credit facility, maximum borrowing capacity	31,667,000
United Kingdom
Debt Instrument [Line Items]
Asset-based credit facility, maximum borrowing capacity	$ 40,000,000