Financial Instruments - Carrying Value and Estimated Fair Value of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Disclosure Financial Instruments Carrying Value And Estimated Fair Value Of Financial Instruments Detail [Line Items]
Cash and cash equivalents, Carrying Amount	$ 35,049	$ 38,753	$ 50,064	$ 63,777
Accounts receivable, net, Carrying Amount	12,717	8,534
Accounts payable, Carrying Amount	4,264	1,452
Cash and cash equivalents, Fair Value	35,049	38,753
Accounts receivable, net, Fair Value	12,717	8,534
Accounts payable, Fair Value	$ 4,264	$ 1,452