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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, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 237,832	$ 247,287	$ 231,603	$ 223,975	$ 244,726	$ 240,135	$ 225,574	$ 209,997	$ 940,698	$ 920,432	$ 840,586
Cost of revenues	175,588	187,602	183,123	207,713	195,776	185,218	181,360	199,547	754,025	761,901	695,050
Gross margin	62,244	59,685	48,480	16,262	48,950	54,917	44,214	10,450	186,673	158,531	145,536
Net (loss) income	$ 16,856	$ 19,087	$ 11,240	$ (9,123)	$ 10,486	$ 14,785	$ 11,126	$ (11,227)	$ 38,062	$ 25,170	$ 18,799
Basic (loss) income per common share	$ 2.28	$ 2.59	$ 1.54	$ (1.25)	$ 1.44	$ 2.03	$ 1.53	$ (1.55)	$ 5.18	$ 3.46	$ 2.60
Diluted (loss) income per common share	$ 2.21	$ 2.50	$ 1.46	$ (1.25)	$ 1.38	$ 1.96	$ 1.47	$ (1.55)	$ 4.98	$ 3.33	$ 2.55

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