Schedule II - Valuation and Qualifying Accounts and Reserves (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Movement in Valuation Allowances and Reserves [Roll Forward]
Adjustment to foreign net operating loss carryforwards	$ 5,900	$ 58,800
Allowance for doubtful accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	13,392	9,995	$ 8,229
Additions charged to costs and expenses	1,286	3,798	2,452
Accounts written off	(4,642)	(1,496)	(225)
Translation adjustments	(863)	1,095	(461)
Balance at end of period	9,173	13,392	9,995
Valuation Allowance of Deferred Tax Assets [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	207,483	152,752	339,395
Additions charged to costs and expenses	(1,821)	35,646	(171,408)
Accounts written off	(3,887)	0	0
Translation adjustments	(9,269)	19,085	(15,235)
Balance at end of period	$ 200,280	207,483	152,752
Scenario, Adjustment [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Adjustment to foreign net operating loss carryforwards		$ (58,800)	$ (7,600)