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Quarterly Financial Information - Summary of Quarterly Financial Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
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, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Effect of Fourth Quarter Events [Line Items]                              
Revenues $ 193,757 $ 198,725 $ 181,959 $ 166,400 $ 174,467 $ 174,899 $ 150,804 $ 136,185 $ 145,341 $ 149,854 $ 129,760 $ 112,011 $ 740,841 $ 636,355 [1] $ 536,966 [1]
Cost of revenues 152,600 155,835 145,481 157,469 137,467 135,056 203,682 126,745 123,105 120,238 106,120 105,002 611,385 602,950 [1] 454,465 [1]
Net (loss) income $ 11,447 $ 10,973 $ 8,902 $ (5,828) $ 8,653 $ 8,866 $ (39,782) $ (3,283) $ 4,630 $ 8,725 $ 5,519 $ (3,201) $ 25,494 $ (25,546) [1] $ 15,673 [1]
Basic (loss) earnings per share $ 1.59 $ 1.52 $ 1.24 $ (0.82) $ 1.22 $ 1.24 $ (5.55) $ (0.46) $ 0.65 $ 1.22 $ 0.78 $ (0.46) $ 3.55 $ (3.57) [1] $ 2.21 [1]
Diluted (loss) earnings per share 1.55 1.49 1.21 (0.82) 1.20 1.19 (5.55) (0.46) 0.62 1.18 0.75 (0.46) $ 3.47 $ (3.57) [1] $ 2.12 [1]
Common stock market prices:                              
High 53.00 45.32 49.79 44.06 45.38 63.45 63.19 102.20 98.00 73.49 62.82 53.27      
Low $ 34.00 $ 32.19 $ 32.05 $ 25.21 $ 18.25 $ 39.47 $ 41.96 $ 57.82 $ 66.33 $ 48.08 $ 48.50 $ 38.15      
As Previously Reported [Member]                              
Effect of Fourth Quarter Events [Line Items]                              
Revenues     $ 182,395 $ 166,917 $ 175,016 $ 174,959 $ 151,069 $ 135,140 $ 144,524 $ 147,971 $ 128,798 $ 111,551   $ 636,184 $ 532,844
Cost of revenues     146,231 157,941 140,975 217,741 121,217 125,834 120,223 117,785 105,072 103,240   605,767 446,320
Net (loss) income     $ 8,746 $ (5,802) $ 7,034 $ (37,818) $ 7,283 $ (3,583) $ 5,561 $ 8,994 $ 5,886 $ (2,549)   $ (27,084) $ 17,892
Basic (loss) earnings per share     $ 1.22 $ (0.81) $ 0.99 $ (5.27) $ 1.02 $ (0.50) $ 0.78 $ 1.26 $ 0.83 $ (0.36)   $ (3.78) $ 2.52
Diluted (loss) earnings per share     1.19 (0.81) 0.97 (5.27) 0.98 (0.50) 0.74 1.21 0.80 (0.36)   $ (3.78) $ 2.42
Common stock market prices:                              
High     49.79 44.06 45.38 63.45 63.19 102.20 98.00 73.49 62.82 53.27      
Low     $ 32.05 $ 25.21 $ 18.25 $ 39.47 $ 41.96 $ 57.82 $ 66.33 $ 48.08 $ 48.50 $ 38.15      
Prior Period Adjustments [Member]                              
Effect of Fourth Quarter Events [Line Items]                              
Revenues     $ (436) $ (517) $ (549) $ (60) $ (265) $ 1,045 $ 817 $ 1,883 $ 962 $ 460      
Cost of revenues     (750) (472) (3,508) (82,685) 82,465 911 2,882 2,453 1,048 1,762      
Net (loss) income     $ 156 $ (26) $ 1,619 $ 46,684 $ (47,065) $ 300 $ (931) $ (269) $ (367) $ (652)   $ 1,538 $ (2,219)
Basic (loss) earnings per share     $ 0.02 $ (0.01) $ 0.23 $ 6.51 $ (6.57) $ 0.04 $ (0.13) $ (0.04) $ (0.05) $ (0.10)      
Diluted (loss) earnings per share     $ 0.02 $ (0.01) $ 0.23 $ 6.46 $ (6.53) $ 0.04 $ (0.12) $ (0.03) $ (0.05) $ (0.10)      
[1] See Note 2. Restatement of Previously Issued Consolidated Financial Statements