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Selected Quarterly Data (Unaudited) - Summary of Selected Quarterly Data (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 86,115 | $ 92,375 | $ 99,656 | $ 103,831 | $ 112,137 | $ 117,841 | $ 112,749 | $ 107,871 | $ 381,977 | $ 450,598 | $ 389,215
Operating Income | 16,506 | 23,122 | 16,208 | 24,542 | 36,665 | 38,927 | 22,502 | 32,626 | 80,378 | 130,720 | 113,504
Net Income (Loss) Attributable to Common Stockholders | $ 6,636 | $ (649) | $ 9,777 | $ 19,342 | $ 18,879 | $ 37,340 | $ 19,543 | $ 21,938 | $ 35,106 | $ 97,700 | $ 75,190
Earnings (loss) per share—Basic (in $ per share) | $ 0.78 | $ (0.07) | $ 1.10 | $ 2.16 | $ 2.09 | $ 4.10 | $ 2.14 | $ 2.41 | $ 3.99 | $ 10.75 | $ 9.18
Earnings (loss) per share—Diluted (in $ per share) | $ 0.76 | $ (0.07) | $ 1.08 | $ 2.11 | $ 2.05 | $ 4.02 | $ 2.10 | $ 2.34 | $ 3.92 | $ 10.51 | $ 8.92
Net tax benefit of federal corporate income tax return |  |  |  |  |  | $ 15,500 |  |  |  |  |

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