Financing Arrangements (Asset Based Revolving Credit Facility) - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Asset-based credit facility, maximum borrowing capacity	$ 230,000,000
Asset-based credit facility	0	25,660,000
Amount outstanding under letters of credit	1,278,000
Cash and cash equivalents	33,462,000	36,793,000	37,399,000	52,003,000
Borrowing base availability	23,000,000
Debt instrument maximum additional borrowing capacity amount	72,188,000
Total available liquidity	105,650,000
Average outstanding borrowing	84,168,000
Average available liquidity	77,625,000
Asset-based credit facility, maturity date	Jun. 23, 2019
Applicable margin rate reduction	The applicable margin for any month will be reduced by 0.25% if the Company’s availability ratio is greater than or equal to 67% and the Company’s “leverage ratio” (as defined below) is less than 4.0 to 1.0 as of the last day of the month for which financial statements have been delivered, so long as no default or event of default exists.
Line of credit facility conditional reduction in margin rate	0.25%
Asset-based credit facility, interest rate	4.23%
Asset-based credit facility, origination fees	4,913,000
Unamortized origination fees	2,359,000	2,295,000
Asset-based credit facility, origination fees included in other current assets	497,000	918,000
Asset-based credit facility, origination fees included in other long-term assets	1,862,000	1,377,000
Minimum
Debt Instrument [Line Items]
Availability ratio required to reduce applicable margin	67.00%
Maximum
Debt Instrument [Line Items]
Leverage ratio required to reduce applicable margin	4
United States
Debt Instrument [Line Items]
Asset-based credit facility, maximum borrowing capacity	160,000,000
Canada
Debt Instrument [Line Items]
Asset-based credit facility, maximum borrowing capacity	25,000,000
United Kingdom
Debt Instrument [Line Items]
Asset-based credit facility, maximum borrowing capacity	$ 45,000,000