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Recently Adopted Accounting Standard - Additional Information (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of adopting guidance, increase in retained earnings $ 101,218   $ 93,605
Adjustments [Member] | Accounting Standards Update 2014-09 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of adopting guidance, increase in retained earnings $ (3,883) $ 3,670