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Quarterly Data - Selected Quarterly Data (Detail)
$ / shares in Units, $ in Thousands, ft² in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
ft²
$ / shares
$ / Item
Sep. 30, 2017
USD ($)
ft²
$ / shares
$ / Item
Jun. 30, 2017
USD ($)
ft²
$ / shares
$ / Item
Mar. 31, 2017
USD ($)
ft²
$ / shares
$ / Item
Dec. 31, 2016
USD ($)
ft²
$ / shares
$ / Item
Sep. 30, 2016
USD ($)
ft²
$ / shares
$ / Item
Jun. 30, 2016
USD ($)
ft²
$ / shares
$ / Item
Mar. 31, 2016
USD ($)
ft²
$ / shares
$ / Item
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Selected Quarterly Financial Data [Line Items]                      
Net sales $ 131,392 $ 116,526 $ 120,630 $ 120,615 $ 118,217 $ 114,558 $ 117,115 $ 111,485 $ 489,163 $ 461,375 $ 421,682
Cost of goods sold 94,432 87,952 89,817 89,624 85,862 86,756 83,744 79,955 361,825 336,317 312,840
Selling and administrative 10,389 8,867 9,193 9,304 9,554 9,241 10,163 8,960 37,753 37,918 34,891
Total costs and operating expenses 104,821 96,819 99,010 98,928 95,416 95,997 93,907 88,915 399,578 374,235 377,677
Operating income 26,571 19,707 21,620 21,687 22,801 18,561 23,208 22,570 89,585 87,140 44,005
Other expense, net (563) 146 (135) (644) (223) (5,900) 6 154 (1,196) (5,963) (751)
Interest expense (2,822) (2,988) (3,062) (2,916) (3,098) (3,146) (3,648) (3,698) (11,788) (13,590) (16,432)
Income before losses from equity method investment and provision for income tax 23,186 16,865 18,423 18,127 19,480 9,515 19,566 19,026 76,601 67,587 26,822
Losses from equity method investment (158) (204) 345 (170) (10) (291) (240) (195) (187) (736) (750)
Income before provision for income taxes 23,028 16,661 18,768 17,957 19,470 9,224 19,326 18,831 76,414 66,851 26,072
Provision for income taxes 1,208 (5,674) (6,370) (5,730) (6,879) (3,014) (6,604) (6,330) (16,566) (22,827) (9,336)
Net income $ 24,236 $ 10,987 $ 12,398 $ 12,227 $ 12,591 $ 6,210 $ 12,722 $ 12,501 $ 59,848 $ 44,024 $ 16,736
Net income per share:                      
Basic (usd per share) | $ / shares $ 0.64 $ 0.29 $ 0.32 $ 0.31 $ 0.32 $ 0.15 $ 0.31 $ 0.30 $ 1.55 $ 1.08 $ 0.39
Diluted (usd per share) | $ / shares $ 0.64 $ 0.29 $ 0.32 $ 0.31 $ 0.31 $ 0.15 $ 0.31 $ 0.30 $ 1.54 $ 1.08 $ 0.39
Net Sales Price | $ / Item 144.78 144.90 150.32 147.92 141.61 144.34 144.86 144.62      
Depreciation, Depletion and Amortization $ 10,643 $ 12,057 $ 12,474 $ 11,286 $ 10,990 $ 11,868 $ 11,842 $ 11,946      
Wallboard                      
Net income per share:                      
Wallboard sales volume (msf) | ft² 725 644 647 650 666 634 643 617