Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Valuation and Qualifying Accounts Disclosure [Line Items] |
|
|
|
| Provision For Doubtful Accounts |
$ 14,053
|
$ 16,369
|
$ 16,461
|
| Allowance for Doubtful Accounts [Member] |
|
|
|
| Valuation and Qualifying Accounts Disclosure [Line Items] |
|
|
|
| Valuation Allowances and Reserves, Balance, Beginning Balance |
14,300
|
14,200
|
21,000
|
| Provision For Doubtful Accounts |
14,100
|
16,400
|
16,400
|
| Write-Offs |
(11,900)
|
(16,300)
|
(23,200)
|
| Valuation Allowances and Reserves, Balance, Ending Balance |
16,500
|
14,300
|
14,200
|
| Allowance for Doubtful Accounts - Discontinued Operations [Member] |
|
|
|
| Valuation and Qualifying Accounts Disclosure [Line Items] |
|
|
|
| Provision For Doubtful Accounts |
|
100
|
600
|
| Estimated Revenue Adjustments [Member] |
|
|
|
| Valuation and Qualifying Accounts Disclosure [Line Items] |
|
|
|
| Valuation Allowances and Reserves, Balance, Beginning Balance |
3,100
|
3,900
|
6,400
|
| Provision for Estimated Revenue Adjustments |
6,100
|
5,100
|
9,400
|
| Write-Offs |
(5,200)
|
(5,900)
|
(11,900)
|
| Valuation Allowances and Reserves, Balance, Ending Balance |
$ 4,000
|
3,100
|
3,900
|
| Estimated Revenue Adjustments, Discontinued Operations [Member] |
|
|
|
| Valuation and Qualifying Accounts Disclosure [Line Items] |
|
|
|
| Provision for Estimated Revenue Adjustments |
|
$ 100
|
$ 400
|