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Income Taxes - Attributes Available for Utilization (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($)
U.S. federal net operating losses [Member] |
Operating Loss Carryforwards [Line Items] |
Attribute amount | $ 1.4
Deferred Tax Asset Attributes, First Year of Expiration | Dec. 31, 2024
U.S. state net operating losses [Member] |
Operating Loss Carryforwards [Line Items] |
Attribute amount | $ 1,313.5
Deferred Tax Asset Attributes, First Year of Expiration | Dec. 31, 2016
U.S. federal tax credits [Member] |
Operating Loss Carryforwards [Line Items] |
Attribute amount | $ 28.6
Deferred Tax Asset Attributes, First Year of Expiration | Dec. 31, 2021
U.S. state tax credits [Member] |
Operating Loss Carryforwards [Line Items] |
Attribute amount | $ 5.8
Deferred Tax Asset Attributes, First Year of Expiration | Dec. 31, 2027
Foreign net operating losses [Member] |
Operating Loss Carryforwards [Line Items] |
Attribute amount | $ 296.2
Deferred Tax Asset Attributes, First Year of Expiration | Dec. 31, 2016

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