Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2014
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Net income	$ 3,454,000		$ 17,662,000	$ 11,000,000	$ 25,000,000
Revenue	248,359,000		245,575,000	724,097,000	725,358,000
Gross profit	$ 127,458,000		$ 125,194,000	$ 378,239,000	$ 368,638,000
Net income per diluted common share	$ 0.07		$ 0.37	$ 0.23	$ 0.52
Interest rate of debt, stated percentage	0.75%		0.75%	0.75%	0.75%
Notional amount of derivative assets and liabilities	$ 191,800,000			$ 191,800,000		$ 161,800,000
Out-of-Period Adjustment Related to Bill and Hold Transactions [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Net income		$ (300,000)
Revenue		(3,400,000)
Gross profit		$ (500,000)
Net income per diluted common share		$ (0.01)
Designated as Cash Flow Hedges [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Notional amount of derivative assets and liabilities	3,800,000			3,800,000		3,200,000
ASU 2015-11 Inventory Valuation [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Increase in inventory valuation				1,700,000
Foreign Exchange Contracts [Member] | Designated as Cash Flow Hedges [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Notional amount of derivative assets and liabilities	3,800,000			3,800,000		3,200,000
Adjustments [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Net income						(600,000)	$ (1,300,000)
As Previously Reported [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Net income						$ 45,500,000	$ 33,500,000
0.75% Convertible Senior Notes Due 2019 [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Debt discount	$ 63,600,000			$ 63,600,000
Interest rate of debt, stated percentage	0.75%			0.75%				0.75%
Effective interest rate percentage	4.98%			4.98%
Debt instrument, maturity date				Sep. 01, 2019
Debt Issuance Costs [Member] | 0.75% Convertible Senior Notes Due 2019 [Member]
Organization Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Effective interest rate percentage	5.46%			5.46%