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Financial Instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Fair Value Disclosures [Abstract]    
Cash and cash equivalents, Carrying Amount $ 52,736 $ 63,777
Accounts receivable, net, Carrying Amount 10,741 8,480
Accounts payable, Carrying Amount 2,710 2,797
Long-term debt - (including current maturities), Carrying Amount 17,980 18,480
Cash and cash equivalents, Fair Value 52,736 63,777
Accounts receivable, net, Fair Value 10,741 8,480
Accounts payable, Fair Value 2,710 2,797
Long-term debt - (including current maturities), Fair Value $ 17,980 $ 18,480