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Stockholders' Equity (Prepaid Share Repurchase Forward Contract) - Additional Information (Detail) - Share Repurchase Plan [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2013
Subsequent Event [Line Items]    
Repurchase of common stock under prepaid forward contract   $ 29,923
Repurchase of Common stock, shares   622,751
Prepaid stock repurchases forward contract settlement period 2019