Debt - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Line of Credit Facility [Line Items]
Asset based senior secured revolving credit	$ 120.0
Credit facility maturity date	Dec. 21, 2017
Revolving credit borrowing	78.7	62.0	72.5
Weighted average interest rate	2.75%
Letters of credit outstanding	3.6
Additional committed borrowing capacity	39.5
Capital lease and other obligations	1.8
Fixed charge coverage ratio of credit facility	1.25%
Minimum [Member]
Line of Credit Facility [Line Items]
Unused commitment fees	0.30%
Fixed charge coverage ratio	10.0
Maximum [Member]
Line of Credit Facility [Line Items]
Unused commitment fees	0.375%
Fixed charge coverage ratio	15.0
Revolving credit facility [Member]
Line of Credit Facility [Line Items]
Revolving credit borrowing	$ 76.9	$ 59.8	$ 72.0
Amended amortization on real estate component of borrowing base [Member]
Line of Credit Facility [Line Items]
Amortization on real estate component of borrowing base	12 years 6 months