Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail)

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Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
Equity [Abstract]  
Other comprehensive income (loss) before reclassifications, tax expense $ 18
Amounts reclassified out of accumulated other comprehensive income (loss), tax expense $ 1,081