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Quarterly Financial Information - Summary of Quarterly Financial Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 144,524 $ 147,971 $ 128,798 $ 111,551 $ 113,661 $ 111,069 $ 95,500 $ 82,422 $ 532,844 $ 402,652 $ 314,874
Cost of revenues 120,223 117,785 105,072 103,240 91,409 89,505 79,159 75,865 446,320 335,938 271,422
Net (loss) income $ 5,561 $ 8,994 $ 5,886 $ (2,549) $ 5,789 $ 5,812 $ 3,743 $ (2,213) $ 17,892 $ 13,131 $ 14,318
Basic (loss) earnings per share $ 0.78 $ 1.26 $ 0.83 $ (0.36) $ 0.83 $ 0.83 $ 0.54 $ (0.22) $ 2.52 $ 1.70 $ 1.42
Diluted (loss) earnings per share $ 0.74 $ 1.21 $ 0.80 $ (0.36) $ 0.80 $ 0.81 $ 0.53 $ (0.22) $ 2.42 $ 1.67 $ 1.41
Common stock market prices:                      
High $ 98.00 $ 73.49 $ 62.82 $ 53.27 $ 39.49 $ 28.96 $ 21.45 $ 21.10      
Low $ 66.33 $ 48.08 $ 48.50 $ 38.15 $ 26.19 $ 19.99 $ 18.88 $ 15.68