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Restatement of Previously Issued Condensed Consolidated Financial Statements - Impact on Condensed Consolidated Statement of Comprehensive Income (Unaudited) (Parenthetical) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Quantifying Misstatement in Current Year Financial Statements [Line Items]        
Unrealized gains (losses) on marketable securities, tax $ 10 $ (11) [1] $ 33 $ 17 [1]
As Previously Reported [Member]        
Quantifying Misstatement in Current Year Financial Statements [Line Items]        
Unrealized gains (losses) on marketable securities, tax   $ 11   $ 17
[1] See Note 2. Restatement of Previously Issued Condensed Consolidated Financial Statements