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Income Taxes - Operating Loss Carry Forwards (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2016
Minimum [Member] | 2017 - 2021 [Member]
Income Taxes [Line Items]
Expiration Dates	2017
Minimum [Member] | 2022 - 2026 [Member]
Income Taxes [Line Items]
Expiration Dates	2022
Minimum [Member] | 2027 - 2031 [Member]
Income Taxes [Line Items]
Expiration Dates	2027
Minimum [Member] | 2032 - 2036 [Member]
Income Taxes [Line Items]
Expiration Dates	2032
Maximum [Member] | 2017 - 2021 [Member]
Income Taxes [Line Items]
Expiration Dates	2021
Maximum [Member] | 2022 - 2026 [Member]
Income Taxes [Line Items]
Expiration Dates	2026
Maximum [Member] | 2027 - 2031 [Member]
Income Taxes [Line Items]
Expiration Dates	2031
Maximum [Member] | 2032 - 2036 [Member]
Income Taxes [Line Items]
Expiration Dates	2036

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- Definition

Income Taxes [Line Items]

+ References

No definition available.

+ Details

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- Definition

Net operating loss carry forwards expiration dates.

+ References

No definition available.

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