Fair Value Measurements and Fair Values of Financial Instruments - Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Detail) - Fair Value Measurements Nonrecurring [Member] - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Estimate	$ 1,581	$ 2,388
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Estimate		$ 93
Significant Unobservable Inputs (Level 3) [Member] | Fair Value Adjustment to Inventory [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value Estimate	$ 93
Valuation Technique	Estimated salvage
Unobservable Input	Salvage valuation and liquidation adjustments
Significant Unobservable Inputs (Level 3) [Member] | Minimum [Member] | Fair Value Adjustment to Inventory [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range	88.00%
Significant Unobservable Inputs (Level 3) [Member] | Maximum [Member] | Fair Value Adjustment to Inventory [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Range	90.00%