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Comprehensive Income - Summary of Amounts Reclassified out of Accumulated Other Comprehensive Income (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Accumulated Other Comprehensive Income Loss [Line Items]  
Beginning Balances $ 176,500
Other comprehensive earnings (loss) before reclassifications (286)
Amounts reclassified out of other comprehensive loss (64)
Net current period other comprehensive loss (350)
Ending Balances 151,067
Unrealized Gains and Losses on Cash Flow Hedges [Member]  
Accumulated Other Comprehensive Income Loss [Line Items]  
Other comprehensive earnings (loss) before reclassifications (286)
Amounts reclassified out of other comprehensive loss (64)
Net current period other comprehensive loss (350)
Ending Balances (350)
Accumulated Other Comprehensive Income [Member]  
Accumulated Other Comprehensive Income Loss [Line Items]  
Ending Balances $ (350)