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Lines of Business (Tables)
 3 Months Ended
Mar. 31, 2013
Segment Reporting [Abstract]  
Lines of Business
The following is a summary of certain financial data for each of our segments (in thousands):

9.    Lines of Business, continued

 
Animal
Hospital
 
Laboratory
 
All Other
 
Corporate
 
Intercompany
Eliminations
 
Total
Three Months Ended
March 31, 2013
 
 
 
 
 
 
 
 
 
 
 
External revenue
$
340,615

 
$
73,638

 
$
24,353

 
$
—

 
$
—

 
$
438,606

Intercompany revenue
—

 
13,697

 
4,170

 
—

 
(17,867
)
 
—

Total revenue
340,615

 
87,335

 
28,523

 
—

 
(17,867
)
 
438,606

Direct costs
295,416

 
44,870

 
18,889

 
—

 
(17,492
)
 
341,683

Gross profit
45,199

 
42,465

 
9,634

 
—

 
(375
)
 
96,923

Selling, general and administrative expense
8,325

 
8,005

 
8,914

 
14,602

 
—

 
39,846

Operating income (loss) before charges
36,874

 
34,460

 
720

 
(14,602
)
 
(375
)
 
57,077

Net loss (gain) on sale or disposal of assets
1,729

 
(5
)
 
2

 
—

 
—

 
1,726

Operating income (loss)
$
35,145

 
$
34,465

 
$
718

 
$
(14,602
)
 
$
(375
)
 
$
55,351

Depreciation and amortization
$
13,387

 
$
2,507

 
$
1,965

 
$
819

 
$
(439
)
 
$
18,239

Property and equipment additions
$
14,441

 
$
1,918

 
$
1,333

 
$
640

 
$
(363
)
 
$
17,969

Three Months Ended
March 31, 2012
 
 
 
 
 
 
 
 
 
 
 
External revenue
$
316,125

 
$
71,971

 
$
21,369

 
$
—

 
$
—

 
$
409,465

Intercompany revenue
—

 
12,759

 
4,956

 
—

 
(17,715
)
 
—

Total revenue
316,125

 
84,730

 
26,325

 
—

 
(17,715
)
 
409,465

Direct costs
270,569

 
44,179

 
17,658

 
—

 
(16,320
)
 
316,086

Gross profit
45,556

 
40,551

 
8,667

 
—

 
(1,395
)
 
93,379

Selling, general and administrative expense
7,057

 
7,598

 
9,283

 
15,113

 
—

 
39,051

Operating income (loss) before charges
38,499

 
32,953

 
(616
)
 
(15,113
)
 
(1,395
)
 
54,328

Net loss (gain) on sale or disposal of assets
505

 
(7
)
 
8

 
17

 
—

 
523

Operating income (loss)
$
37,994

 
$
32,960

 
$
(624
)
 
$
(15,130
)
 
$
(1,395
)
 
$
53,805

Depreciation and amortization
$
11,344

 
$
2,553

 
$
2,263

 
$
764

 
$
(362
)
 
$
16,562

Property and equipment additions
$
10,766

 
$
1,067

 
$
1,722

 
$
2,983

 
$
(466
)
 
$
16,072


At March 31, 2013
 
 
 
 
 
 
 
 
 
 
 
Total assets
$
1,762,143

 
$
255,689

 
$
97,095

 
$
55,959

 
$
(33,184
)
 
$
2,137,702

At December 31, 2012
 
 
 
 
 
 
 
 
 
 
 
Total assets
$
1,648,578

 
$
244,551

 
$
98,159

 
$
127,963

 
$
(27,671
)
 
$
2,091,580