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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
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-Article 12
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Contractual interest rate for funds borrowed, under the debt agreement.

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Date the foreign currency exchange rate derivatives mature or expire, in CCYY-MM-DD format.

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Derivative Financial Instruments - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2019 USD ($) Derivative	Mar. 31, 2019 INR (₨) Derivative	Jun. 18, 2013 USD ($)
1.25% Call Option [Member]
Derivative [Line Items]
Debt instrument interest rate	1.25%	1.25%
Foreign Exchange Forward Contracts [Member]
Derivative [Line Items]
Number of contracts \| Derivative	9	9
Derivative notional amount outstanding	$ 2,300,000	₨ 160,000,000
Unrealized derivatives gains included in other comprehensive (loss) income reclassified into income	$ 400,000
Estimated period of unrealized gains included in AOCI reclassified into income	12 months
1.25% Notes Embedded Cash Conversion Option [Member]
Derivative [Line Items]
Debt instrument interest rate	1.25%	1.25%
1.25% Notes Embedded Cash Conversion Option [Member] \| Level 3 [Member] \| Fair Value Measurements, Recurring [Member]
Derivative [Line Items]
Fair value liability of embedded cash conversion option			$ 82,800,000
Minimum [Member] \| Foreign Exchange Forward Contracts [Member]
Derivative [Line Items]
Date of contracts mature	Apr. 30, 2019
Maximum [Member] \| Foreign Exchange Forward Contracts [Member]
Derivative [Line Items]
Date of contracts mature	Dec. 31, 2019