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Summary of the Unaudited Quarterly Results of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Schedule of Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 527,477 us-gaap_SalesRevenueNet |  | $ 491,697 us-gaap_SalesRevenueNet |  | $ 486,021 us-gaap_SalesRevenueNet |  | $ 358,120 us-gaap_SalesRevenueNet |  | $ 458,354 us-gaap_SalesRevenueNet |  | $ 439,977 us-gaap_SalesRevenueNet |  | $ 413,126 us-gaap_SalesRevenueNet |  | $ 324,229 us-gaap_SalesRevenueNet |  | $ 415,847 us-gaap_SalesRevenueNet |  | $ 405,917 us-gaap_SalesRevenueNet |  | $ 362,408 us-gaap_SalesRevenueNet |  | $ 277,682 us-gaap_SalesRevenueNet |  | $ 1,863,315 us-gaap_SalesRevenueNet | $ 1,635,686 us-gaap_SalesRevenueNet | $ 1,461,854 us-gaap_SalesRevenueNet
Gross profit | 62,721 us-gaap_GrossProfit |  | 61,628 us-gaap_GrossProfit |  | 61,613 us-gaap_GrossProfit |  | 46,672 us-gaap_GrossProfit |  | 52,587 us-gaap_GrossProfit |  | 61,497 us-gaap_GrossProfit |  | 58,853 us-gaap_GrossProfit |  | 42,186 us-gaap_GrossProfit |  | 54,339 us-gaap_GrossProfit |  | 50,074 us-gaap_GrossProfit |  | 39,681 us-gaap_GrossProfit |  | 19,729 us-gaap_GrossProfit |  | 232,634 us-gaap_GrossProfit | 215,123 us-gaap_GrossProfit | 163,823 us-gaap_GrossProfit
Net Income | $ 19,088 us-gaap_NetIncomeLoss |  | $ 18,307 us-gaap_NetIncomeLoss |  | $ 16,239 us-gaap_NetIncomeLoss |  | $ 7,296 us-gaap_NetIncomeLoss |  | $ 10,423 us-gaap_NetIncomeLoss | [1] | $ 16,236 us-gaap_NetIncomeLoss | [1] | $ 14,135 us-gaap_NetIncomeLoss | [1] | $ 5,735 us-gaap_NetIncomeLoss | [1] | $ 80,184 us-gaap_NetIncomeLoss | [1],[2] | $ 18,441 us-gaap_NetIncomeLoss | [1],[2] | $ 1,942 us-gaap_NetIncomeLoss | [1],[2] | $ 5,064 us-gaap_NetIncomeLoss | [1],[2] | $ 60,930 us-gaap_NetIncomeLoss | $ 46,529 us-gaap_NetIncomeLoss | $ 105,631 us-gaap_NetIncomeLoss
Basic net income per share | $ 0.28 us-gaap_EarningsPerShareBasic |  | $ 0.26 us-gaap_EarningsPerShareBasic |  | $ 0.23 us-gaap_EarningsPerShareBasic |  | $ 0.11 us-gaap_EarningsPerShareBasic |  | $ 0.15 us-gaap_EarningsPerShareBasic |  | $ 0.24 us-gaap_EarningsPerShareBasic |  | $ 0.20 us-gaap_EarningsPerShareBasic |  | $ 0.08 us-gaap_EarningsPerShareBasic |  |  |  |  |  |  |  |  |  | $ 0.88 us-gaap_EarningsPerShareBasic | $ 0.67 us-gaap_EarningsPerShareBasic | $ 1.53 us-gaap_EarningsPerShareBasic
Diluted net income per share | $ 0.27 us-gaap_EarningsPerShareDiluted | [3] | $ 0.25 us-gaap_EarningsPerShareDiluted | [3] | $ 0.23 us-gaap_EarningsPerShareDiluted | [3] | $ 0.10 us-gaap_EarningsPerShareDiluted | [3] | $ 0.15 us-gaap_EarningsPerShareDiluted | [3] | $ 0.23 us-gaap_EarningsPerShareDiluted | [3] | $ 0.20 us-gaap_EarningsPerShareDiluted | [3] | $ 0.08 us-gaap_EarningsPerShareDiluted | [3] |  |  |  |  |  |  |  |  | $ 0.85 us-gaap_EarningsPerShareDiluted | $ 0.67 us-gaap_EarningsPerShareDiluted | $ 1.53 us-gaap_EarningsPerShareDiluted
Basic and diluted net income per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.16 us-gaap_EarningsPerShareBasicAndDiluted | [3] | $ 0.27 us-gaap_EarningsPerShareBasicAndDiluted | [3] | $ 0.03 us-gaap_EarningsPerShareBasicAndDiluted | [3] | $ 0.07 us-gaap_EarningsPerShareBasicAndDiluted | [3] |  |  |
[1] | Net income includes pre-tax charges of $0.6 million, $0.2 million and less than $0.1 million for the first, second and third quarters of 2013, respectively, and $1.7 million, $13.6 million, $2.4 million and $0.5 million for the first, second, third and fourth quarters of 2012, respectively, in connection with acquisition related charges associated with the Company’s acquisition of Walker as well as the purchase of certain assets of Beall.
[2] | Net income for the fourth quarter of 2012 includes an income tax benefit of $59.0 million primarily related to the reversal of a U.S. valuation allowance against its deferred tax assets.
[3] | Basic and diluted net income per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly net income per share may differ from annual net income per share due to rounding.

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