Condensed Consolidating Statements of Cash Flows (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jul. 24, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net (loss) income		$ (52,165)	$ 11,228	$ (22,310)	$ 30,157
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Asset impairment charge and loss on divestiture, net	$ 98,278	98,278		98,278
Provision for doubtful accounts				1,980	3,176
Amortization of deferred financing costs				1,545	1,545
Amortization of long-term liabilities				109	98
Share-based compensation expense		2,230	2,071	7,866	5,890
Depreciation and amortization		16,191	15,935	50,206	46,941
Gain on sale of rental fleet				(4,523)	(4,273)
Loss on disposal of property, plant and equipment				548	472
Deferred income taxes				(12,891)	15,167
Foreign currency exchange				(69)	29
Changes in certain assets and liabilities, net of effect of businesses acquired:
Receivables				(9,029)	(3,183)
Inventories				(922)	(1,443)
Other assets				1,875	(497)
Accounts payable				3,217	(3,200)
Accrued liabilities				340	4,953
Net cash provided by operating activities				116,220	95,832
Cash flows from investing activities:
Proceeds from sale of assets held for sale				3,508
Additions to rental fleet, excluding acquisitions		(27,144)	(22,918)	(65,620)	(45,945)
Proceeds from sale of rental fleet				11,447	9,602
Additions to property, plant and equipment, excluding acquisitions				(14,635)	(12,816)
Proceeds from sale of property, plant and equipment				603	780
Net cash used in investing activities				(64,697)	(48,379)
Cash flows from financing activities:
Net (repayments) borrowings under lines of credit				(24,062)	(281)
Deferred financing costs					(12)
Principal payments on capital lease obligations				(6,683)	(5,526)
Issuance of common stock				3,617	4,685
Dividend payments				(33,312)	(30,120)
Purchase of treasury stock				(668)	(8,359)
Net cash used in financing activities				(61,108)	(39,613)
Effect of exchange rate changes on cash				1,069	632
Net (decrease) increase in cash				(8,516)	8,472
Cash and cash equivalents at beginning of period				13,451	4,137
Cash and cash equivalents at end of period		4,935	12,609	4,935	12,609
Eliminations
Cash flows from operating activities:
Net (loss) income				(8,983)
Changes in certain assets and liabilities, net of effect of businesses acquired:
Net cash provided by operating activities				(8,983)
Cash flows from financing activities:
Intercompany				8,983
Net cash used in financing activities				8,983
Guarantors
Cash flows from operating activities:
Net (loss) income		(48,904)	6,093	(17,692)	16,845
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Asset impairment charge and loss on divestiture, net		88,822		88,822
Provision for doubtful accounts				1,884	2,839
Amortization of deferred financing costs				1,545	1,545
Amortization of long-term liabilities				109	98
Share-based compensation expense				7,704	5,671
Depreciation and amortization		14,241	14,065	43,902	41,503
Gain on sale of rental fleet				(3,949)	(4,014)
Loss on disposal of property, plant and equipment				525	105
Deferred income taxes				(12,152)	13,649
Foreign currency exchange				(48)
Changes in certain assets and liabilities, net of effect of businesses acquired:
Receivables				(10,533)	(2,153)
Inventories				(605)	(232)
Other assets				2,233	728
Accounts payable				2,482	(2,961)
Accrued liabilities				(1,898)	3,772
Intercompany				26,039	274
Net cash provided by operating activities				128,368	77,669
Cash flows from investing activities:
Proceeds from sale of assets held for sale				3,416
Additions to rental fleet, excluding acquisitions				(59,506)	(36,757)
Proceeds from sale of rental fleet				8,885	8,599
Additions to property, plant and equipment, excluding acquisitions				(8,923)	(10,010)
Proceeds from sale of property, plant and equipment				585	78
Net cash used in investing activities				(55,543)	(38,090)
Cash flows from financing activities:
Net (repayments) borrowings under lines of credit				(34,814)	(96)
Deferred financing costs					(12)
Principal payments on capital lease obligations				(6,656)	(5,481)
Issuance of common stock				3,617	4,685
Dividend payments				(33,312)	(30,120)
Purchase of treasury stock				(668)	(8,359)
Net cash used in financing activities				(71,833)	(39,383)
Net (decrease) increase in cash				992	196
Cash and cash equivalents at beginning of period				803	1,260
Cash and cash equivalents at end of period		1,795	1,456	1,795	1,456
Non-Guarantors
Cash flows from operating activities:
Net (loss) income		(3,261)	5,135	4,365	13,312
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Asset impairment charge and loss on divestiture, net		9,456		9,456
Provision for doubtful accounts				96	337
Share-based compensation expense				162	219
Depreciation and amortization		1,950	1,870	6,304	5,438
Gain on sale of rental fleet				(574)	(259)
Loss on disposal of property, plant and equipment				23	367
Deferred income taxes				(739)	1,518
Foreign currency exchange				(21)	29
Changes in certain assets and liabilities, net of effect of businesses acquired:
Receivables				1,504	(1,030)
Inventories				(317)	(1,211)
Other assets				(358)	(1,225)
Accounts payable				735	(239)
Accrued liabilities				2,238	1,181
Intercompany				(26,039)	(274)
Net cash provided by operating activities				(3,165)	18,163
Cash flows from investing activities:
Proceeds from sale of assets held for sale				92
Additions to rental fleet, excluding acquisitions				(6,114)	(9,188)
Proceeds from sale of rental fleet				2,562	1,003
Additions to property, plant and equipment, excluding acquisitions				(5,712)	(2,806)
Proceeds from sale of property, plant and equipment				18	702
Net cash used in investing activities				(9,154)	(10,289)
Cash flows from financing activities:
Net (repayments) borrowings under lines of credit				10,752	(185)
Principal payments on capital lease obligations				(27)	(45)
Intercompany				(8,983)
Net cash used in financing activities				1,742	(230)
Effect of exchange rate changes on cash				1,069	632
Net (decrease) increase in cash				(9,508)	8,276
Cash and cash equivalents at beginning of period				12,648	2,877
Cash and cash equivalents at end of period		$ 3,140	$ 11,153	$ 3,140	$ 11,153