Stockholder's Equity - Schedule of Changes in Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Components Of Other Comprehensive Income Loss [Line Items] |
|
|
|
| Marketable securities, Balance at beginning of year |
$ 47,112
|
$ 154,169
|
$ 105,419
|
| Unrealized gain (loss) arising during the year |
(48,647)
|
(107,057)
|
48,514
|
| Less reclassification adjustment for amounts included in realized loss |
1,730
|
|
236
|
| Marketable securities, Balance at end of year |
195
|
47,112
|
154,169
|
| Currency translation, Balance at beginning of year |
(154,173)
|
(133,816)
|
(135,165)
|
| Arising during the year |
(18,211)
|
(20,357)
|
1,349
|
| Currency translation, Balance at end of year |
(172,384)
|
(154,173)
|
(133,816)
|
| Interest rate swap |
(445)
|
|
|
| Interest rate swap, Balance at end of year |
(445)
|
|
|
| Balance at beginning of year |
(182,039)
|
(35,016)
|
(95,253)
|
| Other comprehensive income (loss) |
(63,319)
|
(147,023)
|
60,237
|
| Balance at end of year |
(245,358)
|
(182,039)
|
(35,016)
|
| Defined Benefit Pension Plans |
|
|
|
| Components Of Other Comprehensive Income Loss [Line Items] |
|
|
|
| Balance at beginning of year |
(75,260)
|
(56,644)
|
(66,402)
|
| Amortization of prior service cost and net losses included in net periodic pension cost |
2,884
|
2,107
|
2,776
|
| Net actuarial gain (loss) arising during year |
(336)
|
(20,723)
|
5,952
|
| Plan curtailment |
|
|
1,030
|
| Balance at end of year |
(72,712)
|
(75,260)
|
(56,644)
|
| OPEB |
|
|
|
| Components Of Other Comprehensive Income Loss [Line Items] |
|
|
|
| Balance at beginning of year |
282
|
1,275
|
895
|
| Amortization of prior service cost and net losses included in net periodic pension cost |
(547)
|
(626)
|
(663)
|
| Net actuarial gain (loss) arising during year |
253
|
(367)
|
395
|
| Plan amendment |
|
|
648
|
| Balance at end of year |
$ (12)
|
$ 282
|
$ 1,275
|