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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash and Cash Equivalents [Line Items]
Percentage of fixed interest rate	6.89%	13.64%
Bank certificates of deposit [member] | Bottom of range [member]
Cash and Cash Equivalents [Line Items]
Percentage of accrued interest on certificate of deposits	50.00%	75.00%
Bank certificates of deposit [member] | Top of range [member]
Cash and Cash Equivalents [Line Items]
Percentage of accrued interest on certificate of deposits	106.00%	106.00%

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- Definition

Cash and cash equivalents1 [Line Items].

+ References

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- Definition

Percentage of fixed interest rate on cash deposit.

+ References

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- Definition

Percentage of floating rate on cash deposit.

+ References

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