Stockholders' Equity - Schedule of Share Repurchase Authorized by Board of Directors (Detail) |
6 Months Ended |
---|---|
Jun. 30, 2017
USD ($)
| |
April, 2014 [Member] | |
Equity, Class of Treasury Stock [Line Items] | |
Share Repurchase Authorization | $ 200,000,000 |
Expiration | Dec. 31, 2015 |
February, 2015 [Member] | |
Equity, Class of Treasury Stock [Line Items] | |
Share Repurchase Authorization | $ 150,000,000 |
Expiration | Dec. 31, 2016 |
January, 2016 [Member] | |
Equity, Class of Treasury Stock [Line Items] | |
Share Repurchase Authorization | $ 200,000,000 |
Expiration | Dec. 31, 2017 |
April, 2016 [Member] | |
Equity, Class of Treasury Stock [Line Items] | |
Share Repurchase Authorization | $ 113,182,000 |
Expiration | Dec. 31, 2017 |
November, 2016 [Member] | |
Equity, Class of Treasury Stock [Line Items] | |
Share Repurchase Authorization | $ 236,000,000 |
Expiration | Dec. 31, 2018 |