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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Line Items]
Percentage of fixed interest rate	6.39%	6.89%
Bottom of range [member] | Bank certificates of deposit [member]
Cash and Cash Equivalents [Line Items]
Percentage of accrued interest on certificate of deposits	40.00%	50.00%
Top of range [member] | Bank certificates of deposit [member]
Cash and Cash Equivalents [Line Items]
Percentage of accrued interest on certificate of deposits	106.00%	106.00%

X

- Definition

Cash and cash equivalents1 [line items].

+ References

No definition available.

+ Details

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X

- Definition

Percentage of fixed interest rate on cash deposit.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of floating rate on cash deposit.

+ References

No definition available.

+ Details

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- Details

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X

- Details

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X

- Details

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