Stockholders' Equity - Summary of Shares Repurchased Under Stock Purchase Program (Detail) - $ / shares |
3 Months Ended | |
---|---|---|
Mar. 31, 2016 |
Mar. 31, 2015 |
|
Summary Of Shares Repurchased Under Stock Purchase Program [Abstract] | ||
Number of shares repurchased | 100,000 | |
Average price of shares repurchased | $ 55.23 | |
Shares remaining to be repurchased | 66,276 | 194,723 |