Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319

Name:	us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Income Taxes - Schedule of Foreign Tax Credits (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Tax Credit Carryforward [Line Items]
Foreign Tax Credits, Total	$ 95,145	$ 33,699
2024 [Member]
Tax Credit Carryforward [Line Items]
Foreign Tax Credits, Total	6,600
2025 [Member]
Tax Credit Carryforward [Line Items]
Foreign Tax Credits, Total	27,400
2026 [Member]
Tax Credit Carryforward [Line Items]
Foreign Tax Credits, Total	28,400
United States [Member]
Tax Credit Carryforward [Line Items]
Foreign Tax Credits, Total	95,100
United States [Member] \| Foreign Tax Credit Carryforwards [Member]
Tax Credit Carryforward [Line Items]
Foreign Tax Credits, Total	$ 62,400