Changes in Accounting Principles - Summary of adjustments made to the consolidated financial statements (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
Consolidated Statement of Income
Cost of goods sold										$ 4,609,161		$ 4,526,551		$ 4,524,676	[1]
Gross profit		$ 165,102	$ 198,854	$ 195,823	$ 200,082	$ 200,838	$ 225,143	$ 210,119	$ 200,395	759,861		836,495		802,529	[1]
Warehousing, marketing and administrative expenses										629,825		675,913		595,673	[1]
Income before income taxes										94,655		10,199		182,888	[1]
Income tax expense										30,803		54,541		70,773	[1]
Net income (loss)		$ (2,353)	$ 36,742	$ 12,933	$ 16,530	$ (95,836)	$ 27,667	$ 29,834	$ (6,007)	$ 63,852	[1]	$ (44,342)	[1]	$ 112,115	[1]
Net income per share
Basic		$ (0.06)	$ 1.00	$ 0.35	$ 0.45	$ (2.61)	$ 0.74	$ 0.79	$ (0.16)	$ 1.75		$ (1.18)		$ 2.90	[1]
Diluted		$ (0.06)	$ 0.99	$ 0.35	$ 0.45	$ (2.61)	$ 0.74	$ 0.78	$ (0.16)	$ 1.73		$ (1.18)		$ 2.87	[1]
Consolidated Statement of Comprehensive Income
Net income (loss)		$ (2,353)	$ 36,742	$ 12,933	$ 16,530	$ (95,836)	$ 27,667	$ 29,834	$ (6,007)	$ 63,852	[1]	$ (44,342)	[1]	$ 112,115	[1]
Comprehensive income (loss)	[1]									74,987		(39,142)		89,212
Consolidated Statement of Cash Flows
Net income (loss)		(2,353)	$ 36,742	$ 12,933	16,530	(95,836)	$ 27,667	$ 29,834	(6,007)	63,852	[1]	(44,342)	[1]	112,115	[1]
Deferred income taxes										(10,624)		(23,162)		(10,879)	[1]
Inventories										47,148		(12,467)		(18,724)	[1]
Cash provided by operating activities										130,942		162,734		77,133	[1]
Consolidated Statement of Shareholders’ Equity
Retained earnings at beginning of year					$ 1,463,821				1,529,224	1,463,821		1,529,224		1,438,870
Retained earnings at end of year		$ 1,507,057				$ 1,463,821				$ 1,507,057		1,463,821		1,529,224
Previous Method [Member]
Consolidated Statement of Income
Cost of goods sold														4,516,704
Gross profit														810,501
Warehousing, marketing and administrative expenses														592,050
Income before income taxes														194,483
Income tax expense														75,285
Net income (loss)														$ 119,198
Net income per share
Basic														$ 3.08
Diluted														$ 3.05
Consolidated Statement of Comprehensive Income
Net income (loss)														$ 119,198
Comprehensive income (loss)														96,295
Consolidated Statement of Cash Flows
Net income (loss)														119,198
Deferred income taxes														(6,367)
Inventories														(30,319)
Cash provided by operating activities														77,133
Consolidated Statement of Shareholders’ Equity
Retained earnings at beginning of year									1,541,675			1,541,675		1,444,238
Retained earnings at end of year														1,541,675
Effect Of Change [Member]
Consolidated Statement of Income
Cost of goods sold														7,972
Gross profit														(7,972)
Warehousing, marketing and administrative expenses														3,623
Income before income taxes														(11,595)
Income tax expense														(4,512)
Net income (loss)														$ (7,083)
Net income per share
Basic														$ (0.18)
Diluted														$ (0.18)
Consolidated Statement of Comprehensive Income
Net income (loss)														$ (7,083)
Comprehensive income (loss)														(7,083)
Consolidated Statement of Cash Flows
Net income (loss)														(7,083)
Deferred income taxes														(4,512)
Inventories														11,595
Consolidated Statement of Shareholders’ Equity
Retained earnings at beginning of year									$ (12,451)			$ (12,451)		(5,368)
Retained earnings at end of year														$ (12,451)

[1] Revised in 2015 for the impact of the changes in accounting principle related to inventory accounting.