Margin for Borrowings under Revolving Credit Facility (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Revolving Credit Facility
Debt Instrument [Line Items]
Average Daily Availability	$ 37,200,000
Level III | Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Average Daily Availability	20,000,000
Level II | Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Average Daily Availability	20,000,000
Level II | Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Average Daily Availability	10,000,000
Level I | Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Average Daily Availability	$ 10,000,000
Base Rate | Level III
Debt Instrument [Line Items]
Loans Rate	0.50%
Base Rate | Level II
Debt Instrument [Line Items]
Loans Rate	0.75%
Base Rate | Level I
Debt Instrument [Line Items]
Loans Rate	1.00%
London Interbank Offered Rate | Level III
Debt Instrument [Line Items]
Loans Rate	1.50%
London Interbank Offered Rate | Level II
Debt Instrument [Line Items]
Loans Rate	1.75%
London Interbank Offered Rate | Level I
Debt Instrument [Line Items]
Loans Rate	2.00%