Accounts Receivable (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 61,739	$ 71,335
Allowance for doubtful accounts	(1,617)	(1,417)
Total	$ 60,122	$ 69,918