Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended			23 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 15, 2018
Schedule Of Significant Accounting Policies Summary [Line Items]
Depreciation expense	$ 14,118	$ 14,024	$ 15,146
Provision for taxes repatriation of foreign earnings	4,200	(4,000)		$ 200
Deferred tax asset reduction U.S. corporate tax rate	4,200	(7,200)
Cost of Revenue	(768,885)	(663,513)	(575,409)
Other income	$ 1,311	$ 1,943	1,236
Forward Contracts | Minimum
Schedule Of Significant Accounting Policies Summary [Line Items]
Foreign exchange contract term	1 month
Forward Contracts | Maximum
Schedule Of Significant Accounting Policies Summary [Line Items]
Foreign exchange contract term	18 months
Customer Concentration Risk | Accounts Receivable
Schedule Of Significant Accounting Policies Summary [Line Items]
Percentage of major customer net receivables to total receivables (as a percent)	66.00%	59.00%
Accounting Standards Update 2017-12
Schedule Of Significant Accounting Policies Summary [Line Items]
Unrealized losses	$ 500
Derivative assets	$ 500			$ 500
Accounting Standards Update 2016-02
Schedule Of Significant Accounting Policies Summary [Line Items]
Right-of-use asset					$ 22,000
Lease liability					$ 23,000
Restatement Adjustment [Member] | Accounting Standards Update 2017-07
Schedule Of Significant Accounting Policies Summary [Line Items]
Cost of Revenue		$ 600	500
Other income		$ 500	$ 300