Receivables - Schedule of Activity in Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Allowance For Doubtful Accounts Receivable Rollforward
Allowance for doubtful accounts receivables, Beginning balance	$ 29,662	$ 11,230	$ 16,386	$ 12,882
Bad debt expense, net of recoveries	180	2,065	13,831	2,579
Charge-offs, foreign currency translation and other adjustments	(4,748)	274	(5,123)	(1,892)
Allowance for doubtful accounts receivables, Ending balance	$ 25,094	$ 13,569	$ 25,094	$ 13,569