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Accounting Standards Adopted in Current Period - Additional Information (Detail)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]  
Tax Act from accumulated other comprehensive loss to retained earnings $ 2,485 [1]
Intra-Entity Transfers of Assets Other Than Inventory  
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]  
Cumulative adjustment to decrease retained earnings $ 48,624
[1] Amounts in parentheses indicate debits