Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Changes in Accumulated Other Comprehensive Income, Net of Income Taxes (Parenthetical) (Detail)

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Stockholders' Equity - Changes in Accumulated Other Comprehensive Income, Net of Income Taxes (Parenthetical) (Detail)
Sep. 30, 2018
USD ($)
Equity [Abstract]  
Undistributed earnings of foreign subsidiary $ 0