Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Tax Disclosure [Abstract]        
Income tax expense $ 7,844 $ 18,595 [1] $ 17,821 $ 22,577 [1]
Income before income taxes $ 20,777 $ 48,429 [1] $ 47,284 $ 46,404 [1]
Effective income tax percent 37.80% 38.40% 37.70% 48.70%
United States statutory income tax rate, percent     35.00%  
[1] During the third quarter of 2015, the Company elected a change in accounting principle for the valuation method of certain inventories to the last-in, first-out (“LIFO”) method from the first-in, first out method (“FIFO”). This change required retrospective application. As such, the financial statements presented for prior periods are titled “Revised”.