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Quarterly Results for 2016 and 2015 - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Percentage of decrease in net income | 53.20% |  |  |  |  |  |  |  |  |  |
Decrease in net income during period | $ 15,500 |  |  |  |  |  |  |  |  |  |
Net income | $ 13,655 | $ 26,882 | $ 33,647 | $ 25,226 | $ 29,152 | $ 30,298 | $ 24,704 | $ 22,330 | $ 99,410 | $ 106,484 | $ 72,988

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