Other Receivables and Current Assets - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Other receivables and current assets	$ 239,349	$ 200,233
Receivables related to unrecognized revenue
Other receivables and current assets	199,119	170,186
Income taxes receivable, including overpayments and refunds
Other receivables and current assets	15,718	7,877
Prepaid expenses and other current assets
Other receivables and current assets	$ 24,512	$ 22,170