Accounts Receivable (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 58,680	$ 71,335
Allowance for doubtful accounts	(1,855)	(1,417)
Total	$ 56,825	$ 69,918