Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands |
6 Months Ended |
|
Jun. 30, 2017 |
Dec. 31, 2016 |
| Property Plant And Equipment [Line Items] |
|
|
|
| Land |
|
$ 2,953
|
$ 3,789
|
| Vehicles and machinery |
|
139,076
|
131,584
|
| Buildings and improvements |
[1] |
24,637
|
22,750
|
| Furniture, office and computer equipment |
|
68,881
|
63,969
|
| Property, plant and equipment |
|
235,547
|
222,092
|
| Accumulated depreciation |
|
(84,911)
|
(72,895)
|
| Property, plant and equipment, net |
|
$ 150,636
|
$ 149,197
|
| Vehicles and machinery | Minimum |
|
|
|
| Property Plant And Equipment [Line Items] |
|
|
|
| Residual Value as Percentage of Original Cost |
|
0.00%
|
|
| Estimated Useful Life in Years |
|
5 years
|
|
| Vehicles and machinery | Maximum |
|
|
|
| Property Plant And Equipment [Line Items] |
|
|
|
| Residual Value as Percentage of Original Cost |
|
55.00%
|
|
| Estimated Useful Life in Years |
|
30 years
|
|
| Buildings and improvements | Minimum |
|
|
|
| Property Plant And Equipment [Line Items] |
|
|
|
| Residual Value as Percentage of Original Cost |
[1] |
0.00%
|
|
| Estimated Useful Life in Years |
[1] |
3 years
|
|
| Buildings and improvements | Maximum |
|
|
|
| Property Plant And Equipment [Line Items] |
|
|
|
| Residual Value as Percentage of Original Cost |
[1] |
25.00%
|
|
| Estimated Useful Life in Years |
[1] |
30 years
|
|
| Furniture, office and computer equipment | Minimum |
|
|
|
| Property Plant And Equipment [Line Items] |
|
|
|
| Estimated Useful Life in Years |
|
3 years
|
|
| Furniture, office and computer equipment | Maximum |
|
|
|
| Property Plant And Equipment [Line Items] |
|
|
|
| Estimated Useful Life in Years |
|
10 years
|
|
|
|