Quarterly Results of Operations (Unaudited) - Schedule of Quarterly Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 107,971	$ 100,346	$ 127,922	$ 119,228	$ 106,091	$ 123,640	$ 142,439	$ 166,561	$ 455,469	$ 538,731	$ 844,310
Cost of sales	72,356	63,050	87,549	82,440	77,794	77,633	79,881	93,096	305,394	328,404	459,286
Gross profit	35,615	37,296	40,373	36,788	28,297	46,007	62,558	73,465
Operating income (loss)	(5,110)	(62,045)	(1,114)	(870)	(4,634)	22,933	45,217	49,343	(69,136)	112,859	248,835
Net income (loss)	$ (71,492)	$ (29,260)	$ 15	$ 94	$ 1,302	$ 19,013	$ 36,137	$ 36,769	$ (100,639)	$ 93,221	$ 192,008
Earnings (loss) per share:
Basic (in dollars per share)	$ (1.90)	$ (0.78)	$ 0.00	$ 0.00	$ 0.03	$ 0.51	$ 0.96	$ 0.97	$ (2.69)	$ 2.48	$ 5.00
Diluted (in dollars per share)	$ (1.90)	$ (0.78)	$ 0.00	$ 0.00	$ 0.03	$ 0.51	$ 0.96	$ 0.97	$ (2.69)	$ 2.47	$ 4.98