Receivables - Schedule of Activity in Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance For Doubtful Accounts Receivable Rollforward
Allowance for doubtful accounts receivables, Beginning balance	$ 16,386	$ 12,882	$ 23,540
Bad debt expense, net of recoveries	15,419	10,055	3,125
Charge-offs, foreign currency translation and other adjustments	(8,059)	(6,551)	(13,783)
Allowance for doubtful accounts receivables, Ending balance	$ 23,746	$ 16,386	$ 12,882