Information Pertaining to 2022 Notes (Detail) $ in Thousands	3 Months Ended
Mar. 31, 2017 USD ($)
Debt Instrument [Line Items]
Beginning balance	$ 8,221
Ending balance	1,088
2022 Notes
Debt Instrument [Line Items]
Beginning balance	8,221
Amortization of debt discount	77
Amortization of debt issue costs	3
Exchange of 2022 Notes	(8,400)
Write-off of debt discount and debt issue costs associated with extinguishment of debt	1,187
Ending balance	1,088
2022 Notes \| Principal Amount of 2022 Notes
Debt Instrument [Line Items]
Principal Amount of Notes, Beginning Balance	9,575
Exchange of 2022 Notes	(8,400)
Principal Amount of Notes, Ending Balance	1,175
2022 Notes \| Debt Discount
Debt Instrument [Line Items]
Beginning balance	(1,307)
Amortization of debt discount	77
Write-off of debt discount and debt issue costs associated with extinguishment of debt	1,146
Ending balance	(84)
2022 Notes \| Debt Issue Costs
Debt Instrument [Line Items]
Beginning balance	(47)
Amortization of debt issue costs	3
Write-off of debt discount and debt issue costs associated with extinguishment of debt	41
Ending balance	$ (3)

Exchange of debt.

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock.

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Face (par) amount of debt instrument at time of issuance.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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