Fair Value Measurements - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2013 Grade
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted-average risk grade of loans underlying interest rate swaps measured at fair value	11.2
Default on the interest rate swaps, weighted average loss severity percentage	25.00%
Accounts receivable collateral discount	20.00%
Inventory collateral discount	50.00%
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Default on the interest rate swaps, loss severity percentage	20.00%
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Default on the interest rate swaps, loss severity percentage	50.00%