Condensed Consolidating Statements of Cash Flows (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash Flows from Operating Activities:    
Net income $ (27,326,000) $ 7,440,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Asset impairment charge 64,726,000 283,000
Provision for doubtful accounts 1,169,000 547,000
Amortization of deferred financing costs 789,000 703,000
Amortization of long-term liabilities 25,000 41,000
Share-based compensation expense 3,250,000 4,164,000
Depreciation and amortization 15,539,000 9,145,000
Gain on sale of rental fleet units (1,972,000) (1,711,000)
Loss on disposal of property, plant and equipment 335,000 72,000
Deferred income taxes (18,233,000) 3,954,000
Foreign currency loss   1,000
Changes in certain assets and liabilities, net of effect of businesses acquired:    
Receivables (636,000) 778,000
Inventories 157,000 228,000
Deposits and prepaid expenses 446,000 (1,276,000)
Other assets and intangibles 9,000 (5,000)
Accounts payable 1,033,000 3,061,000
Accrued liabilities (839,000) (613,000)
Net cash provided by operating activities 38,472,000 26,812,000
Cash Flows from Investing Activities:    
Cash paid for businesses, net of cash acquired (1,200,000) (4,217,000)
Additions to rental fleet (10,480,000) (4,078,000)
Proceeds from sale of rental fleet units 4,842,000 5,627,000
Additions to property, plant and equipment (4,241,000) (2,628,000)
Proceeds from sale of property, plant and equipment 607,000 908,000
Net cash used in investing activities (10,472,000) (4,388,000)
Cash Flows from Financing Activities:    
Net borrowings (repayments) under lines of credit (4,137,000) (16,307,000)
Deferred financing costs (100,000)  
Principal payments on capital lease obligations (849,000) (367,000)
Issuance of common stock 32,000 1,949,000
Dividend payments (8,509,000) (7,849,000)
Purchase of treasury stock (15,284,000) (407,000)
Net cash (used in) provided by financing activities (28,847,000) (22,981,000)
Effect of exchange rate changes on cash 156,000 (132,000)
Net (decrease) increase in cash (691,000) (689,000)
Cash and cash equivalents at beginning of period 3,739,000 1,256,000
Cash and cash equivalents at end of period 3,048,000 567,000
Eliminations    
Changes in certain assets and liabilities, net of effect of businesses acquired:    
Intercompany 161,000  
Net cash provided by operating activities 161,000  
Cash Flows from Financing Activities:    
Net borrowings (repayments) under lines of credit (154,000)  
Principal payments on capital lease obligations (7,000)  
Net cash (used in) provided by financing activities (161,000)  
Guarantors    
Cash Flows from Operating Activities:    
Net income (31,284,000) 5,208,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Asset impairment charge 64,726,000 136,000
Provision for doubtful accounts 947,000 453,000
Amortization of deferred financing costs 775,000 687,000
Amortization of long-term liabilities 25,000 40,000
Share-based compensation expense 3,160,000 3,963,000
Depreciation and amortization 13,848,000 7,277,000
Gain on sale of rental fleet units (1,826,000) (1,500,000)
Loss on disposal of property, plant and equipment 219,000 48,000
Deferred income taxes (19,192,000) 3,201,000
Changes in certain assets and liabilities, net of effect of businesses acquired:    
Receivables 188,000 1,404,000
Inventories (75,000) 285,000
Deposits and prepaid expenses 348,000 (1,416,000)
Other assets and intangibles 9,000 (178,000)
Accounts payable 751,000 1,123,000
Accrued liabilities (467,000) (350,000)
Intercompany 683,000 756,000
Net cash provided by operating activities 32,835,000 21,137,000
Cash Flows from Investing Activities:    
Cash paid for businesses, net of cash acquired   (4,217,000)
Additions to rental fleet (5,745,000) (1,834,000)
Proceeds from sale of rental fleet units 4,268,000 4,781,000
Additions to property, plant and equipment (3,307,000) (2,393,000)
Proceeds from sale of property, plant and equipment 243,000 708,000
Net cash used in investing activities (4,541,000) (2,955,000)
Cash Flows from Financing Activities:    
Net borrowings (repayments) under lines of credit (4,602,000) (10,773,000)
Deferred financing costs (100,000)  
Principal payments on capital lease obligations (828,000) (367,000)
Issuance of common stock 32,000 1,949,000
Dividend payments (8,509,000) (7,849,000)
Purchase of treasury stock (15,284,000) (407,000)
Net cash (used in) provided by financing activities (29,291,000) (17,447,000)
Net (decrease) increase in cash (997,000) 735,000
Cash and cash equivalents at beginning of period 2,977,000 (190,000)
Cash and cash equivalents at end of period 1,980,000 545,000
Non-Guarantors    
Cash Flows from Operating Activities:    
Net income 3,958,000 2,232,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Asset impairment charge   147,000
Provision for doubtful accounts 222,000 94,000
Amortization of deferred financing costs 14,000 16,000
Amortization of long-term liabilities   1,000
Share-based compensation expense 90,000 201,000
Depreciation and amortization 1,691,000 1,868,000
Gain on sale of rental fleet units (146,000) (211,000)
Loss on disposal of property, plant and equipment 116,000 24,000
Deferred income taxes 959,000 753,000
Foreign currency loss   1,000
Changes in certain assets and liabilities, net of effect of businesses acquired:    
Receivables (824,000) (626,000)
Inventories 232,000 (57,000)
Deposits and prepaid expenses 98,000 140,000
Other assets and intangibles   173,000
Accounts payable 282,000 1,938,000
Accrued liabilities (372,000) (263,000)
Intercompany (844,000) (756,000)
Net cash provided by operating activities 5,476,000 5,675,000
Cash Flows from Investing Activities:    
Cash paid for businesses, net of cash acquired (1,200,000)  
Additions to rental fleet (4,735,000) (2,244,000)
Proceeds from sale of rental fleet units 574,000 846,000
Additions to property, plant and equipment (934,000) (235,000)
Proceeds from sale of property, plant and equipment 364,000 200,000
Net cash used in investing activities (5,931,000) (1,433,000)
Cash Flows from Financing Activities:    
Net borrowings (repayments) under lines of credit 619,000 (5,534,000)
Principal payments on capital lease obligations (14,000)  
Net cash (used in) provided by financing activities 605,000 (5,534,000)
Effect of exchange rate changes on cash 156,000 (132,000)
Net (decrease) increase in cash 306,000 (1,424,000)
Cash and cash equivalents at beginning of period 762,000 1,446,000
Cash and cash equivalents at end of period $ 1,068,000 $ 22,000