Shares Repurchased - Additional Information (Detail) - USD ($) |
12 Months Ended | |||
---|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
Oct. 29, 2014 |
|
Equity, Class of Treasury Stock [Line Items] | ||||
Repurchased common stock, value | $ 24,116,000 | $ 6,531,000 | $ 1,613,000 | |
Three-Year Share Repurchase Program [Member] | ||||
Equity, Class of Treasury Stock [Line Items] | ||||
Common stock purchase authorized amount | $ 100,000,000 | |||
Repurchased common stock, shares | 1,190 | |||
Repurchased common stock, value | $ 24,116,000 | |||
Repurchased shares, remaining for future purchases | $ 75,884,000 | |||
Three-Year Share Repurchase Program [Member] | Tax Withholding Obligations [Member] | ||||
Equity, Class of Treasury Stock [Line Items] | ||||
Repurchased common stock, shares | 416 | 137 | ||
Repurchased common stock, value | $ 6,531,000 | $ 1,613,000 |