Interest Expenses Recognized (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Debt Instrument [Line Items]
Contractual interest expense	$ 305		$ 305
Amortization of debt issuance costs	52		52
Total	$ 357		$ 357