Initial Adjustment of Assets to Estimated Net Realizable Value (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended
	Apr. 27, 2013
Adjustments For Change In Accounting Principle [Line Items]
Write up (down) of assets	$ 2,883
Asset Write Up
Adjustments For Change In Accounting Principle [Line Items]
Write up (down) of assets	3,393
Asset Write Down
Adjustments For Change In Accounting Principle [Line Items]
Write up (down) of assets	$ (510)