Quarterly Financial Information - Summary of Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	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]
Revenues	$ 221,098	$ 225,103	$ 203,417	$ 190,968	$ 193,757	$ 198,725	$ 181,959	$ 166,400	$ 840,586	$ 740,841	$ 636,355
Cost of revenues	177,761	175,544	161,164	180,581	152,600	155,835	145,481	157,469	695,050	611,385	602,950
Gross Margin	43,337	49,559	42,253	10,387	41,157	42,890	36,478	8,931	145,536	129,456	33,405
Net (loss) income	$ 8,047	$ 10,233	$ 8,522	$ (8,003)	$ 11,447	$ 10,973	$ 8,902	$ (5,828)	$ 18,799	$ 25,494	$ (25,546)
Basic (loss) earnings per share	$ 1.11	$ 1.41	$ 1.18	$ (1.11)	$ 1.59	$ 1.52	$ 1.24	$ (0.82)	$ 2.60	$ 3.55	$ (3.57)
Diluted (loss) earnings per share	$ 1.08	$ 1.38	$ 1.16	$ (1.11)	$ 1.55	$ 1.49	$ 1.21	$ (0.82)	$ 2.55	$ 3.47	$ (3.57)